These regulations have reined in the proliferation of counties in Kentucky. Since the 1891 Constitution, only McCreary County has been created.[3]
County
| FIPS Code [4] | County seat [5] | Established [5] | Origin
| Etymology
| Population [5] | Area [5] | Map
|
| Adair County | 001 | Columbia | 1802 | Green County | John Adair, Governor of Kentucky (1820–1824) | &0000000000017244.00000017,244 | &0000000000000407.000000407 sq mi (&0000000000001054.0000001,054 km2) |  |
| Allen County | 003 | Scottsville | 1815 | Barren County and Warren County | John Allen (1771–1813), soldier in the War of 1812 | &0000000000017800.00000017,800 | &0000000000000346.000000346 sq mi (&0000000000000896.000000896 km2) |  |
| Anderson County | 005 | Lawrenceburg | 1827 | Franklin County, Washington County and Mercer County | Richard Clough Anderson, Jr., Kentucky and United States legislator (1817–1821) | &0000000000019111.00000019,111 | &0000000000000203.000000203 sq mi (&0000000000000526.000000526 km2) |  |
| Ballard County | 007 | Wickliffe | 1842 | Hickman County and McCracken County | Bland Ballard (1761–1853), soldier in the Battle of Fallen Timbers and Battle of River Raisin | &0000000000008286.0000008,286 | &0000000000000251.000000251 sq mi (&0000000000000650.000000650 km2) |  |
| Barren County | 009 | Glasgow | 1798 | Green County and Warren County | The Barrens, a region of grassland in Kentucky | &0000000000038033.00000038,033 | &0000000000000491.000000491 sq mi (&0000000000001272.0000001,272 km2) |  |
| Bath County | 011 | Owingsville | 1811 | Montgomery County | Medicinal springs located within the county | &0000000000011085.00000011,085 | &0000000000000279.000000279 sq mi (&0000000000000723.000000723 km2) |  |
| Bell County | 013 | Pineville | 1867 | Harlan County and Knox County | Joshua Fry Bell, Kentucky legislator (1862–1867) | &0000000000030060.00000030,060 | &0000000000000361.000000361 sq mi (&0000000000000935.000000935 km2) |  |
| Boone County | 015 | Burlington | 1798 | Campbell County | Daniel Boone (1734–1820), frontiersman | &0000000000085991.00000085,991 | &0000000000000246.000000246 sq mi (&0000000000000637.000000637 km2) |  |
| Bourbon County | 017 | Paris | 1785 | Fayette County | House of Bourbon, European royal house | &0000000000019360.00000019,360 | &0000000000000291.000000291 sq mi (&0000000000000754.000000754 km2) |  |
| Boyd County | 019 | Catlettsburg | 1860 | Greenup County, Carter County and Lawrence County | Linn Boyd, United States Congressman (1835–1837; 1839–1855) and Lieutenant Governor of Kentucky (1859) | &0000000000049752.00000049,752 | &0000000000000160.000000160 sq mi (&0000000000000414.000000414 km2) |  |
| Boyle County | 021 | Danville | 1842 | Lincoln County and Mercer County | John Boyle, Chief Justice of the Kentucky Court of Appeals (1810–1826) | &0000000000027697.00000027,697 | &0000000000000182.000000182 sq mi (&0000000000000471.000000471 km2) |  |
| Bracken County | 023 | Brooksville | 1796 | Mason County and Campbell County | William Bracken, trapper and frontiersman | &0000000000008279.0000008,279 | &0000000000000203.000000203 sq mi (&0000000000000526.000000526 km2) |  |
| Breathitt County | 025 | Jackson | 1839 | Clay County, Perry County and Estill County | John Breathitt, Governor of Kentucky (1832–1834) | &0000000000016100.00000016,100 | &0000000000000495.000000495 sq mi (&0000000000001282.0000001,282 km2) |  |
| Breckinridge County | 027 | Hardinsburg | 1799 | Hardin County | John Breckinridge (1760–1806), Kentucky statesman | &0000000000018648.00000018,648 | &0000000000000572.000000572 sq mi (&0000000000001481.0000001,481 km2) |  |
| Bullitt County | 029 | Shepherdsville | 1796 | Jefferson County and Nelson County | Alexander Scott Bullitt, Lieutenant Governor of Kentucky (1800–1804) | &0000000000061236.00000061,236 | &0000000000000299.000000299 sq mi (&0000000000000774.000000774 km2) |  |
| Butler County | 031 | Morgantown | 1810 | Logan County and Ohio County | Richard Butler (1743–1791), Revolutionary War general | &0000000000013010.00000013,010 | &0000000000000428.000000428 sq mi (&0000000000001109.0000001,109 km2) |  |
| Caldwell County | 033 | Princeton | 1809 | Livingston County | John Caldwell, Lieutenant Governor of Kentucky (1804) | &0000000000013060.00000013,060 | &0000000000000347.000000347 sq mi (&0000000000000899.000000899 km2) |  |
| Calloway County | 035 | Murray | 1822 | Hickman County | Richard Callaway (1724–1780), pioneer | &0000000000034177.00000034,177 | &0000000000000386.000000386 sq mi (&0000000000001000.0000001,000 km2) |  |
| Campbell County | 037 | Alexandria and Newport | 1794 | Harrison County, Mason County and Scott County | John Campbell (1735–1799), Revolutionary War soldier | &0000000000088616.00000088,616 | &0000000000000152.000000152 sq mi (&0000000000000394.000000394 km2) |  |
| Carlisle County | 039 | Bardwell | 1886 | Hickman County | John G. Carlisle, United States legislator (1877–1889) | &0000000000005351.0000005,351 | &0000000000000192.000000192 sq mi (&0000000000000497.000000497 km2) |  |
| Carroll County | 041 | Carrollton | 1838 | Gallatin County, Trimble County, and Henry county | Charles Carroll (1737–1832), last living signer of the Declaration of Independence | &0000000000010155.00000010,155 | &0000000000000130.000000130 sq mi (&0000000000000337.000000337 km2) |  |
| Carter County | 043 | Grayson | 1838 | Greenup County and Lawrence County | William Grayson Carter, Kentucky state senator (1834–1838) | &0000000000026889.00000026,889 | &0000000000000411.000000411 sq mi (&0000000000001064.0000001,064 km2) |  |
| Casey County | 045 | Liberty | 1806 | Lincoln County | William Casey (1754–1816), Revolutionary War soldier | &0000000000015447.00000015,447 | &0000000000000446.000000446 sq mi (&0000000000001155.0000001,155 km2) |  |
| Christian County | 047 | Hopkinsville | 1796 | Logan County | William Christian (1743–1786), Revolutionary War soldier | &0000000000072265.00000072,265 | &0000000000000721.000000721 sq mi (&0000000000001867.0000001,867 km2) |  |
| Clark County | 049 | Winchester | 1792 | Bourbon County and Fayette County | George Rogers Clark (1752–1818), Revolutionary War soldier | &0000000000033144.00000033,144 | &0000000000000254.000000254 sq mi (&0000000000000658.000000658 km2) |  |
| Clay County | 051 | Manchester | 1807 | Madison County, Floyd County, and Knox County | Green Clay (1757–1828), military general and surveyor | &0000000000024556.00000024,556 | &0000000000000471.000000471 sq mi (&0000000000001220.0000001,220 km2) |  |
| Clinton County | 053 | Albany | 1835 | Cumberland County and Wayne County | DeWitt Clinton, Governor of New York (1817–1823) | &0000000000009634.0000009,634 | &0000000000000198.000000198 sq mi (&0000000000000513.000000513 km2) |  |
| Crittenden County | 055 | Marion | 1842 | Livingston County[6] | John Jordan Crittenden, Governor of Kentucky (1848–1850) | &0000000000009384.0000009,384 | &0000000000000362.000000362 sq mi (&0000000000000938.000000938 km2) |  |
| Cumberland County | 057 | Burkesville | 1798 | Green County | The Cumberland River, which flows through the county | &0000000000007147.0000007,147 | &0000000000000306.000000306 sq mi (&0000000000000793.000000793 km2) |  |
| Daviess County | 059 | Owensboro | 1815 | Ohio County | Joseph Hamilton Daveiss (1774–1811), lawyer killed at the Battle of Tippecanoe | &0000000000091545.00000091,545 | &0000000000000462.000000462 sq mi (&0000000000001197.0000001,197 km2) |  |
| Edmonson County | 061 | Brownsville | 1825 | Hart County, Grayson County, and Warren County | John Edmonson (1764–1813), military captain killed at the Battle of River Raisin | &0000000000012085.00000012,085 | &0000000000000303.000000303 sq mi (&0000000000000785.000000785 km2) |  |
| Elliott County | 063 | Sandy Hook | 1869 | Morgan County, Lawrence County, and Carter County | John Lisle Elliott or John Milton Elliott (1820–1885), legislators | &0000000000006748.0000006,748 | &0000000000000234.000000234 sq mi (&0000000000000606.000000606 km2) |  |
| Estill County | 065 | Irvine | 1808 | Clark County and Madison County | James Estill (1750–1782), military captain killed at the Battle of Little Mountain | &0000000000015307.00000015,307 | &0000000000000254.000000254 sq mi (&0000000000000658.000000658 km2) |  |
| Fayette County | 067 | Lexington | 1780 | One of three original Kentucky counties | General Lafayette (1757–1834), Revolutionary War general | &0000000000260512.000000260,512 | &0000000000000284.000000284 sq mi (&0000000000000736.000000736 km2) |  |
| Fleming County | 069 | Flemingsburg | 1798 | Mason County | John Fleming (1735–1791), early settler of Kentucky | &0000000000013792.00000013,792 | &0000000000000351.000000351 sq mi (&0000000000000909.000000909 km2) |  |
| Floyd County | 071 | Prestonsburg | 1800 | Fleming County, Montgomery County, and Mason County | John Floyd (1750–1783), surveyor and pioneer | &0000000000042441.00000042,441 | &0000000000000394.000000394 sq mi (&0000000000001020.0000001,020 km2) |  |
| Franklin County | 073 | Frankfort | 1794 | Mercer County, Shelby County, and Woodford County | Benjamin Franklin (1706–1790), signer of the Declaration of Independence | &0000000000047687.00000047,687 | &0000000000000210.000000210 sq mi (&0000000000000544.000000544 km2) |  |
| Fulton County | 075 | Hickman | 1845 | Hickman County | Robert Fulton (1765–1815), inventor of the first commercially successful steamboat | &0000000000007752.0000007,752 | &0000000000000209.000000209 sq mi (&0000000000000541.000000541 km2) |  |
| Gallatin County | 077 | Warsaw | 1798 | Franklin County and Shelby County | Albert Gallatin, United States Secretary of the Treasury (1801–1814) | &0000000000007870.0000007,870 | &0000000000000099.00000099 sq mi (&0000000000000256.000000256 km2) |  |
| Garrard County | 079 | Lancaster | 1796 | Madison County, Lincoln County, and Mercer County[7] | James Garrard, Governor of Kentucky (1796–1804) | &0000000000014792.00000014,792 | &0000000000000231.000000231 sq mi (&0000000000000598.000000598 km2) |  |
| Grant County | 081 | Williamstown | 1820 | Pendleton County | Samuel Grant (1762–1789 or 1794), John Grant (1754–1826), and / or Squire Grant (1764–1833), early settlers of Kentucky | &0000000000022384.00000022,384 | &0000000000000260.000000260 sq mi (&0000000000000673.000000673 km2) |  |
| Graves County | 083 | Mayfield | 1824 | Hickman County | Benjamin F. Graves (1771–1813), soldier killed at the Battle of River Raisin | &0000000000037028.00000037,028 | &0000000000000556.000000556 sq mi (&0000000000001440.0000001,440 km2) |  |
| Grayson County | 085 | Leitchfield | 1810 | Hardin County and Ohio County | William Grayson (1740–1790), aide to George Washington | &0000000000024053.00000024,053 | &0000000000000504.000000504 sq mi (&0000000000001305.0000001,305 km2) |  |
| Green County | 087 | Greensburg | 1792 | Lincoln County and Nelson County | Nathanael Greene (1742–1786), Revolutionary War general | &0000000000011518.00000011,518 | &0000000000000289.000000289 sq mi (&0000000000000749.000000749 km2) |  |
| Greenup County | 089 | Greenup | 1803 | Mason County | Christopher Greenup, Governor of Kentucky (1804–1808) | &0000000000036891.00000036,891 | &0000000000000346.000000346 sq mi (&0000000000000896.000000896 km2) |  |
| Hancock County | 091 | Hawesville | 1829 | Ohio County, Breckinridge County, and Daviess County | John Hancock (1737–1793), signer of the Declaration of Independence | &0000000000008392.0000008,392 | &0000000000000189.000000189 sq mi (&0000000000000490.000000490 km2) |  |
| Hardin County | 093 | Elizabethtown | 1792 | Nelson County | John Hardin (1753–1792), pioneer | &0000000000094174.00000094,174 | &0000000000000628.000000628 sq mi (&0000000000001627.0000001,627 km2) |  |
| Harlan County | 095 | Harlan | 1819 | Knox County | Silas Harlan (1753–1782), soldier in the Battle of Blue Licks | &0000000000033202.00000033,202 | &0000000000000467.000000467 sq mi (&0000000000001210.0000001,210 km2) |  |
| Harrison County | 097 | Cynthiana | 1793 | Bourbon County and Scott County | Benjamin Harrison (1726–1791), co-author of the Kentucky Constitution | &0000000000017983.00000017,983 | &0000000000000310.000000310 sq mi (&0000000000000803.000000803 km2) |  |
| Hart County | 099 | Munfordville | 1819 | Hardin County and Barren County | Nathaniel G. T. Hart (1784–1813), lawyer captured at the Battle of River Raisin | &0000000000017445.00000017,445 | &0000000000000416.000000416 sq mi (&0000000000001077.0000001,077 km2) |  |
| Henderson County | 101 | Henderson | 1798 | Christian County | Richard Henderson (1734–1785), founder of the Transylvania Company | &0000000000044829.00000044,829 | &0000000000000440.000000440 sq mi (&0000000000001140.0000001,140 km2) |  |
| Henry County | 103 | New Castle | 1798 | Shelby County | Patrick Henry (1736–1799), Revolutionary War patriot | &0000000000015060.00000015,060 | &0000000000000289.000000289 sq mi (&0000000000000749.000000749 km2) |  |
| Hickman County | 105 | Clinton | 1821 | Christian County | Paschal Hickman, military captain killed at the Battle of River Raisin | &0000000000005262.0000005,262 | &0000000000000244.000000244 sq mi (&0000000000000632.000000632 km2) |  |
| Hopkins County | 107 | Madisonville | 1806 | Henderson County | Samuel Hopkins (1753–1819), Revolutionary War general | &0000000000046519.00000046,519 | &0000000000000551.000000551 sq mi (&0000000000001427.0000001,427 km2) |  |
| Jackson County | 109 | McKee | 1858 | Madison County, Estill County, Owsley County, Clay County, Laurel County, and Rockcastle County | Andrew Jackson, President of the United States (1829–1837) | &0000000000013495.00000013,495 | &0000000000000346.000000346 sq mi (&0000000000000896.000000896 km2) |  |
| Jefferson County | 111 | Louisville | 1780 | One of three original Kentucky counties | Thomas Jefferson, President of the United States (1801–1809) | &0000000000693604.000000693,604 | &0000000000000385.000000385 sq mi (&0000000000000997.000000997 km2) |  |
| Jessamine County | 113 | Nicholasville | 1798 | Fayette County | Jessamine Creek | &0000000000039041.00000039,041 | &0000000000000173.000000173 sq mi (&0000000000000448.000000448 km2) |  |
| Johnson County | 115 | Paintsville | 1843 | Floyd County, Lawrence County, and Morgan County | Richard Mentor Johnson, Vice President of the United States (1837–1841) | &0000000000023445.00000023,445 | &0000000000000262.000000262 sq mi (&0000000000000679.000000679 km2) |  |
| Kenton County | 117 | Covington and Independence | 1840 | Campbell County, Kentucky | Simon Kenton (1755–1836), pioneer | &0000000000151464.000000151,464 | &0000000000000163.000000163 sq mi (&0000000000000422.000000422 km2) |  |
| Knott County | 119 | Hindman | 1884 | Perry County, Letcher County, Floyd County, and Breathitt County | James Proctor Knott, Governor of Kentucky (1883–1887) | &0000000000017649.00000017,649 | &0000000000000352.000000352 sq mi (&0000000000000912.000000912 km2) |  |
| Knox County | 121 | Barbourville | 1799 | Lincoln County | Henry Knox, United States Secretary of War (1785–1794) | &0000000000031795.00000031,795 | &0000000000000388.000000388 sq mi (&0000000000001005.0000001,005 km2) |  |
| LaRue County | 123 | Hodgenville | 1843 | Hardin County | John Larue (1746–1792), early settler of Kentucky | &0000000000013373.00000013,373 | &0000000000000263.000000263 sq mi (&0000000000000681.000000681 km2) | File:Map of Kentucky highlighting LaRue County.svg |
| Laurel County | 125 | London | 1825 | Rockcastle County, Clay County, Knox County and Whitley County | Mountain laurel trees that are prominent in the area | &0000000000052715.00000052,715 | &0000000000000436.000000436 sq mi (&0000000000001129.0000001,129 km2) |  |
| Lawrence County | 127 | Louisa | 1821 | Greenup County and Floyd County | James Lawrence (1781–1813), naval commander during the War of 1812 | &0000000000015569.00000015,569 | &0000000000000419.000000419 sq mi (&0000000000001085.0000001,085 km2) |  |
| Lee County | 129 | Beattyville | 1870 | Breathitt County, Estill County, Owsley County, and Wolfe County | Robert E. Lee (1807–1870), Confederate general or Lee County, Virginia | &0000000000007916.0000007,916 | &0000000000000210.000000210 sq mi (&0000000000000544.000000544 km2) |  |
| Leslie County | 131 | Hyden | 1878 | Clay County, Harlan County and Perry County | Preston Leslie, Governor of Kentucky (1871–1875) | &0000000000012401.00000012,401 | &0000000000000404.000000404 sq mi (&0000000000001046.0000001,046 km2) |  |
| Letcher County | 133 | Whitesburg | 1842 | Perry County and Harlan County | Robert P. Letcher, Governor of Kentucky (1840–1844) | &0000000000025277.00000025,277 | &0000000000000339.000000339 sq mi (&0000000000000878.000000878 km2) |  |
| Lewis County | 135 | Vanceburg | 1806 | Mason County | Meriwether Lewis (1774–1809), explorer | &0000000000014092.00000014,092 | &0000000000000484.000000484 sq mi (&0000000000001254.0000001,254 km2) |  |
| Lincoln County | 137 | Stanford | 1780 | One of three original Kentucky counties | Benjamin Lincoln (1733–1810), Revolutionary War general | &0000000000023361.00000023,361 | &0000000000000337.000000337 sq mi (&0000000000000873.000000873 km2) |  |
| Livingston County | 139 | Smithland | 1799 | Christian County | Robert Livingston (1746–1813), one of the Committee of Five that drafted the Declaration of Independence | &0000000000009804.0000009,804 | &0000000000000316.000000316 sq mi (&0000000000000818.000000818 km2) |  |
| Logan County | 141 | Russellville | 1792 | Lincoln County | Benjamin Logan (1742–1802), military general from Virginia | &0000000000026573.00000026,573 | &0000000000000556.000000556 sq mi (&0000000000001440.0000001,440 km2) |  |
| Lyon County | 143 | Eddyville | 1854 | Caldwell County | Chittenden Lyon, United States Representative (1827–1835) | &0000000000008080.0000008,080 | &0000000000000216.000000216 sq mi (&0000000000000559.000000559 km2) |  |
| McCracken County | 145 | Paducah | 1825 | Hickman County | Virgil McCracken, military captain killed at the Battle of River Raisin | &0000000000065514.00000065,514 | &0000000000000251.000000251 sq mi (&0000000000000650.000000650 km2) |  |
| McCreary County | 147 | Whitley City | 1912 | Pulaski County, Wayne County and Whitley County | James McCreary, Governor of Kentucky (1912–1916) | &0000000000017080.00000017,080 | &0000000000000428.000000428 sq mi (&0000000000001109.0000001,109 km2) |  |
| McLean County | 149 | Calhoun | 1854 | Daviess County, Muhlenberg County and Ohio County | Alney McLean (1815–1817; 1819–1821), United States Representative | &0000000000009938.0000009,938 | &0000000000000254.000000254 sq mi (&0000000000000658.000000658 km2) |  |
| Madison County | 151 | Richmond | 1785 | Lincoln County | James Madison, President of the United States (1809–1817) | &0000000000070872.00000070,872 | &0000000000000441.000000441 sq mi (&0000000000001142.0000001,142 km2) |  |
| Magoffin County | 153 | Salyersville | 1860 | Floyd County, Johnson County and Morgan County | Beriah Magoffin, Governor of Kentucky (1859–1862) | &0000000000013332.00000013,332 | &0000000000000310.000000310 sq mi (&0000000000000803.000000803 km2) |  |
| Marion County | 155 | Lebanon | 1834 | Washington County | Francis Marion (1732–1795), Revolutionary War general | &0000000000018212.00000018,212 | &0000000000000347.000000347 sq mi (&0000000000000899.000000899 km2) |  |
| Marshall County | 157 | Benton | 1842 | Calloway County | John Marshall, Chief Justice of the United States Supreme Court (1801–1835) | &0000000000030125.00000030,125 | &0000000000000305.000000305 sq mi (&0000000000000790.000000790 km2) |  |
| Martin County | 159 | Inez | 1870 | Floyd County, Johnson County, Pike County, and Lawrence County | John P. Martin, United States Congressman (1845–1847) | &0000000000012578.00000012,578 | &0000000000000231.000000231 sq mi (&0000000000000598.000000598 km2) |  |
| Mason County | 161 | Maysville | 1788 | Bourbon County[8] | George Mason (1725–1792), statesman | &0000000000016800.00000016,800 | &0000000000000241.000000241 sq mi (&0000000000000624.000000624 km2) |  |
| Meade County | 163 | Brandenburg | 1823 | Breckinridge County and Hardin County | James Meade, killed at the Battle of River Raisin | &0000000000026349.00000026,349 | &0000000000000308.000000308 sq mi (&0000000000000798.000000798 km2) |  |
| Menifee County | 165 | Frenchburg | 1869 | Bath County, Montgomery County, Morgan County, Powell County and Wolfe County | Richard H. Menefee, United States Congressman (1837–1839) | &0000000000006556.0000006,556 | &0000000000000204.000000204 sq mi (&0000000000000528.000000528 km2) |  |
| Mercer County | 167 | Harrodsburg | 1785 | Lincoln County | Hugh Mercer (1726–1777), killed at the Battle of Princeton | &0000000000020817.00000020,817 | &0000000000000251.000000251 sq mi (&0000000000000650.000000650 km2) |  |
| Metcalfe County | 169 | Edmonton | 1860 | Barren County, Hart County, Green County, Adair County, Cumberland County and Monroe County | Thomas Metcalfe, Governor of Kentucky (1828–1832) | &0000000000010037.00000010,037 | &0000000000000291.000000291 sq mi (&0000000000000754.000000754 km2) |  |
| Monroe County | 171 | Tompkinsville | 1820 | Barren County and Cumberland County | James Monroe, President of the United States (1817–1825) | &0000000000011756.00000011,756 | &0000000000000331.000000331 sq mi (&0000000000000857.000000857 km2) |  |
| Montgomery County | 173 | Mount Sterling | 1796 | Clark County[9] | Richard Montgomery (1736–1775), military general killed at the Battle of Quebec | &0000000000022554.00000022,554 | &0000000000000199.000000199 sq mi (&0000000000000515.000000515 km2) |  |
| Morgan County | 175 | West Liberty | 1822 | Bath County and Floyd County | Daniel Morgan (1736–1802), Revolutionary War general | &0000000000013948.00000013,948 | &0000000000000381.000000381 sq mi (&0000000000000987.000000987 km2) |  |
| Muhlenberg County | 177 | Greenville | 1798 | Christian County and Logan County | Peter Muhlenberg (1746–1807), Revolutionary War general | &0000000000031839.00000031,839 | &0000000000000475.000000475 sq mi (&0000000000001230.0000001,230 km2) |  |
| Nelson County | 179 | Bardstown | 1784 | Jefferson County | Thomas Nelson, Jr. (1738–1789), signer of the Declaration of Independence | &0000000000037477.00000037,477 | &0000000000000423.000000423 sq mi (&0000000000001096.0000001,096 km2) |  |
| Nicholas County | 181 | Carlisle | 1799 | Mason County and Bourbon County | George Nicholas (1743–1799), Revolutionary War colonel | &0000000000006813.0000006,813 | &0000000000000197.000000197 sq mi (&0000000000000510.000000510 km2) |  |
| Ohio County | 183 | Hartford | 1798 | Hardin County | The Ohio River, which formed the county's northern border until the creation of Daviess and Hancock counties | &0000000000022916.00000022,916 | &0000000000000594.000000594 sq mi (&0000000000001538.0000001,538 km2) |  |
| Oldham County | 185 | La Grange | 1823 | Henry County, Jefferson County and Shelby County | William Oldham (1753–1791), Revolutionary War colonel | &0000000000046178.00000046,178 | &0000000000000189.000000189 sq mi (&0000000000000490.000000490 km2) |  |
| Owen County | 187 | Owenton | 1819 | Franklin County, Gallatin County and Scott County | Abraham Owen (1769–1811), killed at the Battle of Tippecanoe | &0000000000010547.00000010,547 | &0000000000000352.000000352 sq mi (&0000000000000912.000000912 km2) |  |
| Owsley County | 189 | Booneville | 1843 | Breathitt County, Clay County, and Estill County | William Owsley, Governor of Kentucky (1844–1848) | &0000000000004858.0000004,858 | &0000000000000198.000000198 sq mi (&0000000000000513.000000513 km2) |  |
| Pendleton County | 191 | Falmouth | 1798 | Campbell County and Bracken County | Edmund Pendleton (1721–1803), member of the Continental Congress | &0000000000014390.00000014,390 | &0000000000000280.000000280 sq mi (&0000000000000725.000000725 km2) |  |
| Perry County | 193 | Hazard | 1820 | Floyd County and Clay County | Oliver Hazard Perry (1785–1819), Admiral in the War of 1812 | &0000000000029390.00000029,390 | &0000000000000342.000000342 sq mi (&0000000000000886.000000886 km2) |  |
| Pike County | 195 | Pikeville | 1821 | Floyd County | Zebulon Pike (1779–1813), discoverer of Pike's Peak | &0000000000068736.00000068,736 | &0000000000000788.000000788 sq mi (&0000000000002041.0000002,041 km2) |  |
| Powell County | 197 | Stanton | 1852 | Clark County, Estill County, and Montgomery County | Lazarus Whitehead Powell, Governor of Kentucky (1851–1855) | &0000000000013237.00000013,237 | &0000000000000180.000000180 sq mi (&0000000000000466.000000466 km2) |  |
| Pulaski County | 199 | Somerset | 1798 | Green County and Lincoln County | Casimir Pulaski (1746–1779), Revolutionary War soldier killed at the Battle of Savannah | &0000000000056217.00000056,217 | &0000000000000662.000000662 sq mi (&0000000000001715.0000001,715 km2) |  |
| Robertson County | 201 | Mount Olivet | 1867 | Bracken County, Harrison County, Mason County, and Nicholas County | George Robertson, chief justice of the Kentucky court of appeals (1828–1843) | &0000000000002266.0000002,266 | &0000000000000100.000000100 sq mi (&0000000000000259.000000259 km2) |  |
| Rockcastle County | 203 | Mount Vernon | 1810 | Lincoln County, Madison County, Knox County and Pulaski County | Rockcastle River, the boundary between Rockcastle and Laurel County | &0000000000016582.00000016,582 | &0000000000000318.000000318 sq mi (&0000000000000824.000000824 km2) |  |
| Rowan County | 205 | Morehead | 1856 | Fleming County and Morgan County | John Rowan, Congressman from Kentucky (1809–1811; 1825–1831)) | &0000000000022094.00000022,094 | &0000000000000281.000000281 sq mi (&0000000000000728.000000728 km2) |  |
| Russell County | 207 | Jamestown | 1825 | Adair County, Wayne County and Cumberland County | William Russell (1758–1825), soldier and legislator | &0000000000016315.00000016,315 | &0000000000000254.000000254 sq mi (&0000000000000658.000000658 km2) |  |
| Scott County | 209 | Georgetown | 1792 | Woodford County | Charles Scott, Governor of Kentucky (1808–1812) | &0000000000033061.00000033,061 | &0000000000000285.000000285 sq mi (&0000000000000738.000000738 km2) |  |
| Shelby County | 211 | Shelbyville | 1792 | Jefferson County | Isaac Shelby, Governor of Kentucky (1792–1796; 1812–1816) | &0000000000033337.00000033,337 | &0000000000000384.000000384 sq mi (&0000000000000995.000000995 km2) |  |
| Simpson County | 213 | Franklin | 1819 | Allen County, Logan County and Warren County | John Simpson, military captain killed at the Battle of River Raisin | &0000000000016405.00000016,405 | &0000000000000236.000000236 sq mi (&0000000000000611.000000611 km2) |  |
| Spencer County | 215 | Taylorsville | 1824 | Nelson County, Shelby County, and Bullitt County | Spears Spencer, military captain killed at the Battle of Tippecanoe | &0000000000011766.00000011,766 | &0000000000000186.000000186 sq mi (&0000000000000482.000000482 km2) |  |
| Taylor County | 217 | Campbellsville | 1848 | Green County | Zachary Taylor, President of the United States (1849–1850) | &0000000000022927.00000022,927 | &0000000000000270.000000270 sq mi (&0000000000000699.000000699 km2) |  |
| Todd County | 219 | Elkton | 1819 | Logan County and Christian County | John Todd (1750–1782), military colonel killed at the Battle of Blue Licks | &0000000000011971.00000011,971 | &0000000000000376.000000376 sq mi (&0000000000000974.000000974 km2) |  |
| Trigg County | 221 | Cadiz | 1820 | Christian County and Caldwell County | Stephen Trigg (1744–1782), military colonel killed at the Battle of Blue Licks | &0000000000012597.00000012,597 | &0000000000000443.000000443 sq mi (&0000000000001147.0000001,147 km2) |  |
| Trimble County | 223 | Bedford | 1837 | Gallatin County, Henry County and Oldham County | Robert Trimble, Associate Supreme Court Justice (1826–1828) | &0000000000008125.0000008,125 | &0000000000000149.000000149 sq mi (&0000000000000386.000000386 km2) |  |
| Union County | 225 | Morganfield | 1811 | Henderson County | Unanimous decision of the residents to create a new county | &0000000000015637.00000015,637 | &0000000000000345.000000345 sq mi (&0000000000000894.000000894 km2) |  |
| Warren County | 227 | Bowling Green | 1796 | Logan County | Joseph Warren (1741–1775), Revolutionary War general | &0000000000092522.00000092,522 | &0000000000000545.000000545 sq mi (&0000000000001412.0000001,412 km2) |  |
| Washington County | 229 | Springfield | 1792 | Jefferson County | George Washington, President of the United States (1789–1797) | &0000000000010916.00000010,916 | &0000000000000301.000000301 sq mi (&0000000000000780.000000780 km2) |  |
| Wayne County | 231 | Monticello | 1800 | Pulaski County and Cumberland County | Anthony Wayne (1745–1796), Revolutionary War general | &0000000000019923.00000019,923 | &0000000000000459.000000459 sq mi (&0000000000001189.0000001,189 km2) |  |
| Webster County | 233 | Dixon | 1860 | Henderson County, Hopkins County, and Union County | Daniel Webster, United States Secretary of State (1841–1843; 1850–1852) | &0000000000014120.00000014,120 | &0000000000000335.000000335 sq mi (&0000000000000868.000000868 km2) |  |
| Whitley County | 235 | Williamsburg | 1818 | Knox County | William Whitley (1749–1813), Kentucky pioneer | &0000000000035865.00000035,865 | &0000000000000440.000000440 sq mi (&0000000000001140.0000001,140 km2) |  |
| Wolfe County | 237 | Campton | 1860 | Breathitt County, Owsley County, and Powell County | Nathaniel Wolfe (1808–1865), member of the Kentucky General Assembly | &0000000000007065.0000007,065 | &0000000000000223.000000223 sq mi (&0000000000000578.000000578 km2) |  |
| Woodford County | 239 | Versailles | 1788 | Fayette County | William Woodford (1734–1780), Revolutionary War general | &0000000000023208.00000023,208 | &0000000000000191.000000191 sq mi (&0000000000000495.000000495 km2) |  |
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