County
| FIPS Code [4] | County seat [5] | Established [5] | Origin
| Etymology [6] | Population [5] | Area [5] | Map
|
| Adair County | 001 | Stilwell | 1907 | . | The Adair family of the Cherokee tribe[7] | &0000000000021038.00000021,038 | &0000000000000576.000000576 sq mi (&0000000000001492.0000001,492 km2) |  |
| Alfalfa County | 003 | Cherokee | 1907 | Woods County | William H. "Alfalfa Bill" Murray (1869-1956), ninth Governor of Oklahoma[8] | &Expression error: Unrecognised punctuation character ","Expression error: Unrecognised punctuation character ","Expression error: Unrecognised punctuation character ","Expression error: Unrecognised punctuation character ","Expression error: Unrecognised punctuation character ","Expression error: Unrecognised punctuation character ","Expression error: Unrecognised punctuation character ","Expression error: Unrecognised punctuation character ","Expression error: Unrecognised punctuation character ","Expression error: Unrecognised punctuation character ","Expression error: Unrecognised punctuation character ","Expression error: Unrecognised punctuation character ","Expression error: Unrecognised punctuation character ","Expression error: Unrecognised punctuation character ","Expression error: Unrecognised punctuation character ","Expression error: Unrecognised punctuation character ",".Expression error: Unrecognised punctuation character ","6,105 | &0000000000000867.000000867 sq mi (&0000000000002246.0000002,246 km2) |  |
| Atoka County | 005 | Atoka | 1907 | Choctaw lands | Captain Atoka, a noted Choctaw[9] | &Expression error: Unrecognised punctuation character ","Expression error: Unrecognised punctuation character ","Expression error: Unrecognised punctuation character ","Expression error: Unrecognised punctuation character ","Expression error: Unrecognised punctuation character ","Expression error: Unrecognised punctuation character ","Expression error: Unrecognised punctuation character ","Expression error: Unrecognised punctuation character ","Expression error: Unrecognised punctuation character ","Expression error: Unrecognised punctuation character ","Expression error: Unrecognised punctuation character ","Expression error: Unrecognised punctuation character ","Expression error: Unrecognised punctuation character ","Expression error: Unrecognised punctuation character ","Expression error: Unrecognised punctuation character ","Expression error: Unrecognised punctuation character ",".Expression error: Unrecognised punctuation character ","13,879 | &0000000000000978.000000978 sq mi (&0000000000002533.0000002,533 km2) |  |
| Beaver County | 007 | Beaver | 1890 | Initially encompasses entire panhandle from 1890 to 1907 (as Seventh County); current geography since 1907 | The Beaver River[10] | &Expression error: Unrecognised punctuation character ","Expression error: Unrecognised punctuation character ","Expression error: Unrecognised punctuation character ","Expression error: Unrecognised punctuation character ","Expression error: Unrecognised punctuation character ","Expression error: Unrecognised punctuation character ","Expression error: Unrecognised punctuation character ","Expression error: Unrecognised punctuation character ","Expression error: Unrecognised punctuation character ","Expression error: Unrecognised punctuation character ","Expression error: Unrecognised punctuation character ","Expression error: Unrecognised punctuation character ","Expression error: Unrecognised punctuation character ","Expression error: Unrecognised punctuation character ","Expression error: Unrecognised punctuation character ","Expression error: Unrecognised punctuation character ",".Expression error: Unrecognised punctuation character ","5,857 | &0000000000001814.0000001,814 sq mi (&0000000000004698.0000004,698 km2) |  |
| Beckham County | 009 | Sayre | 1907 | Greer County and Roger Mills County[11] | J. C. W. Beckham (1869-1940), Governor of Kentucky[11] | &0000000000019799.00000019,799 | &0000000000000902.000000902 sq mi (&0000000000002336.0000002,336 km2) |  |
| Blaine County | 011 | Watonga | 1890 | . | James G. Blaine (1830-1893), former Speaker of the United States House of Representatives, U.S. Senator and Secretary of State[12] | &0000000000011976.00000011,976 | &0000000000000929.000000929 sq mi (&0000000000002406.0000002,406 km2) |  |
| Bryan County | 013 | Durant | 1907 | Choctaw lands | William Jennings Bryan (1860-1925), former Secretary of State, famous orator and three-time U.S. Presidential candidate[13] | &0000000000036534.00000036,534 | &0000000000000909.000000909 sq mi (&0000000000002354.0000002,354 km2) |  |
| Caddo County | 015 | Anadarko | 1901 | . | From Indian word "Kaddi" meaning life or chief[14] | &0000000000030150.00000030,150 | &0000000000001278.0000001,278 sq mi (&0000000000003310.0000003,310 km2) |  |
| Canadian County | 017 | El Reno | 1901 | Part of Cheyenne and Arapaho reservation[15] | The Canadian River.[16]. | &0000000000087697.00000087,697 | &0000000000000900.000000900 sq mi (&0000000000002331.0000002,331 km2) |  |
| Carter County | 019 | Ardmore | 1907 | Pickens County, Chickasaw Nation | A prominent early-day family[17] | &0000000000045621.00000045,621 | &0000000000000824.000000824 sq mi (&0000000000002134.0000002,134 km2) |  |
| Cherokee County | 021 | Tahlequah | 1907 | Originally settled by Cherokee Indians following the Trail of Tears | Cherokee Nation[18] | &0000000000042521.00000042,521 | &0000000000000751.000000751 sq mi (&0000000000001945.0000001,945 km2) |  |
| Choctaw County | 023 | Hugo | 1907 | . | Choctaw Nation of Indians[19] | &0000000000015342.00000015,342 | &0000000000000774.000000774 sq mi (&0000000000002005.0000002,005 km2) |  |
| Cimarron County | 025 | Boise City | 1907 | . | Cimarron River[20] | &0000000000003148.0000003,148 | &0000000000001835.0000001,835 sq mi (&0000000000004753.0000004,753 km2) |  |
| Cleveland County | 027 | Norman | 1890 | . | Grover Cleveland (1837-1908), two-time President of the United States[21] | &0000000000208016.000000208,016 | &0000000000000536.000000536 sq mi (&0000000000001388.0000001,388 km2) |  |
| Coal County | 029 | Coalgate | 1907 | Tobucksy County, Choctaw Nation | Coal, the primary economic product of the region at the time[22] | &0000000000006031.0000006,031 | &0000000000000518.000000518 sq mi (&0000000000001342.0000001,342 km2) |  |
| Comanche County | 031 | Lawton | 1907 | Kiowa, Comanche, and Apache reservation | Spanish "Camino Ancho", meaning broad trail[23] | &0000000000114996.000000114,996 | &0000000000001069.0000001,069 sq mi (&0000000000002769.0000002,769 km2) |  |
| Cotton County | 033 | Walters | 1912 | Lands of Quapaws, Choctaws, Chickasaws, Comanche Reservation, and Big Pasture | The principal economic base of the county, cotton[24] | &0000000000006614.0000006,614 | &0000000000000637.000000637 sq mi (&0000000000001650.0000001,650 km2) |  |
| Craig County | 035 | Vinita | 1907 | Cherokee Nation | Granville Craig, a prominent Cherokee[25] | &0000000000014950.00000014,950 | &0000000000000761.000000761 sq mi (&0000000000001971.0000001,971 km2) |  |
| Creek County | 037 | Sapulpa | 1907 | . | Creek tribe[26] | &0000000000067367.00000067,367 | &0000000000000956.000000956 sq mi (&0000000000002476.0000002,476 km2) |  |
| Custer County | 039 | Arapaho | 1891 | Cheyenne-Arapaho Reservation | George Armstrong Custer (1839-1876), a United States Army cavalry commander[27] | &0000000000026142.00000026,142 | &0000000000000987.000000987 sq mi (&0000000000002556.0000002,556 km2) |  |
| Delaware County | 041 | Jay | 1907 | . | Delaware District of old Cherokee Nation[2] | &0000000000037077.00000037,077 | &0000000000000741.000000741 sq mi (&0000000000001919.0000001,919 km2) |  |
| Dewey County | 043 | Taloga | 1892 | Cheyenne-Arapaho Reservation | Either for Admiral George Dewey (1837-1917)[28] or derived from original name, County "D", during land run of 1892 and later changed[2] | &0000000000004743.0000004,743 | &0000000000001000.0000001,000 sq mi (&0000000000002590.0000002,590 km2) |  |
| Ellis County | 045 | Arnett | 1907 | Roger Mills and Woodward counties | Albert H. Ellis, vice president of the Oklahoma Constitutional Convention[29] (name could also be Abraham H. Ellis[2]) | &0000000000004075.0000004,075 | &0000000000001229.0000001,229 sq mi (&0000000000003183.0000003,183 km2) |  |
| Garfield County | 047 | Enid | 1893 | Cherokee Outlet | James Garfield (1831-1881), President of the United States[30] | &0000000000057813.00000057,813 | &0000000000001058.0000001,058 sq mi (&0000000000002740.0000002,740 km2) |  |
| Garvin County | 049 | Pauls Valley | 1907 | Chickasaw Nation | Samuel Garvin, a prominent Chickasaw Indian[31] | &0000000000027210.00000027,210 | &0000000000000809.000000809 sq mi (&0000000000002095.0000002,095 km2) |  |
| Grady County | 051 | Chickasha | 1907 | . | Henry W. Grady (1851-1889), editor of the Atlanta Constitution newspaper[32] | &0000000000045516.00000045,516 | &0000000000001101.0000001,101 sq mi (&0000000000002852.0000002,852 km2) |  |
| Grant County | 053 | Medford | 1892 | Originally "L" county | Ulysses S. Grant (1822-1885), President of the United States[33] | &0000000000005144.0000005,144 | &0000000000001001.0000001,001 sq mi (&0000000000002593.0000002,593 km2) |  |
| Greer County | 055 | Mangum | 1896 | Greer County, Texas | John Alexander Greer, Lieutenant Governor of Texas[34] | &0000000000006061.0000006,061 | &0000000000000639.000000639 sq mi (&0000000000001655.0000001,655 km2) |  |
| Harmon County | 057 | Hollis | 1909 | Greer County | Judson Harmon (1846-1927), U.S. Attorney General and Governors of Ohio[35] | &0000000000003283.0000003,283 | &0000000000000538.000000538 sq mi (&0000000000001393.0000001,393 km2) |  |
| Harper County | 059 | Buffalo | 1893 | . | Oscar G. Harper, clerk of the Oklahoma Constitutional Convention[36] | &0000000000003562.0000003,562 | &0000000000001039.0000001,039 sq mi (&0000000000002691.0000002,691 km2) |  |
| Haskell County | 061 | Stigler | 1907 | . | Charles N. Haskell (1860-1933), first Governor of Oklahoma[37] | &0000000000011792.00000011,792 | &0000000000000577.000000577 sq mi (&0000000000001494.0000001,494 km2) |  |
| Hughes County | 063 | Holdenville | 1907 | . | William C. Hughes, member of the Oklahoma Constitutional Convention[2][38] | &0000000000014154.00000014,154 | &0000000000000807.000000807 sq mi (&0000000000002090.0000002,090 km2) |  |
| Jackson County | 065 | Altus | 1907 | Greer County | Either Stonewall Jackson (1824-1863), Confederate general during the American Civil War[39] or Andrew Jackson (1767-1845), seventh President of the United States[2] | &0000000000028439.00000028,439 | &0000000000000803.000000803 sq mi (&0000000000002080.0000002,080 km2) |  |
| Jefferson County | 067 | Waurika | 1907 | Comanche County and part of Chickasaw Nation | Thomas Jefferson (1743-1826), third President of the United States[40] | &0000000000006818.0000006,818 | &0000000000000759.000000759 sq mi (&0000000000001966.0000001,966 km2) |  |
| Johnston County | 069 | Tishomingo | 1907 | . | Douglas H. Johnston, Governor of the Chickasaw Nation[41] | &0000000000010513.00000010,513 | &0000000000000645.000000645 sq mi (&0000000000001671.0000001,671 km2) |  |
| Kay County | 071 | Newkirk | 1895 | Cherokee Strip | Originally designated as county "K"[42] | &0000000000048080.00000048,080 | &0000000000000919.000000919 sq mi (&0000000000002380.0000002,380 km2) |  |
| Kingfisher County | 073 | Kingfisher | 1907 | Unassigned Lands | Either for a bird[2] or King David Fisher, an early settler in the area[43] | &0000000000013926.00000013,926 | &0000000000000903.000000903 sq mi (&0000000000002339.0000002,339 km2) |  |
| Kiowa County | 075 | Hobart | 1901 | Kiowa-Comanche-Apache Indian Reservations | Kiowa Indian tribe[44] | &0000000000010227.00000010,227 | &0000000000001015.0000001,015 sq mi (&0000000000002629.0000002,629 km2) |  |
| Latimer County | 077 | Wilburton | 1907 | . | James S. Latimer, member of the Oklahoma Constitutional Convention[45] | &0000000000010692.00000010,692 | &0000000000000722.000000722 sq mi (&0000000000001870.0000001,870 km2) |  |
| Le Flore County | 079 | Poteau | 1907 | Choctaw Nation[46] | A Choctaw Indian family of French descent[2] | &0000000000048109.00000048,109 | &0000000000001586.0000001,586 sq mi (&0000000000004108.0000004,108 km2) |  |
| Lincoln County | 081 | Chandler | 1891 | . | Abraham Lincoln, the sixteenth president of the United States | &0000000000032080.00000032,080 | &0000000000000959.000000959 sq mi (&0000000000002484.0000002,484 km2) |  |
| Logan County | 083 | Guthrie | 1891 | . | John Alexander Logan, the American Civil War general | &0000000000033924.00000033,924 | &0000000000000745.000000745 sq mi (&0000000000001930.0000001,930 km2) |  |
| Love County | 085 | Marietta | 1907 | . | Overton Love, a Chickasaw judge and early landowner, and his family | &0000000000008831.0000008,831 | &0000000000000515.000000515 sq mi (&0000000000001334.0000001,334 km2) |  |
| Major County | 093 | Fairview | 1909 | . | John C. Major, an Oklahoma constitutional convention attendee | &0000000000007545.0000007,545 | &0000000000000957.000000957 sq mi (&0000000000002479.0000002,479 km2) |  |
| Marshall County | 095 | Madill | 1907 | . | The maiden name of a member of the Constitutional Convention's mother | &0000000000013184.00000013,184 | &0000000000000371.000000371 sq mi (&0000000000000961.000000961 km2) |  |
| Mayes County | 097 | Pryor | 1907 | . | Cherokee leader Samuel H. Mayes | &0000000000038369.00000038,369 | &0000000000000656.000000656 sq mi (&0000000000001699.0000001,699 km2) |  |
| McClain County | 087 | Purcell | 1907 | . | Charles M. McClain, an Oklahoma constitutional convention attendee | &0000000000027740.00000027,740 | &0000000000000570.000000570 sq mi (&0000000000001476.0000001,476 km2) |  |
| McCurtain County | 089 | Idabel | 1907 | . | The Choctaw McCurtain family | &0000000000034402.00000034,402 | &0000000000001852.0000001,852 sq mi (&0000000000004797.0000004,797 km2) |  |
| McIntosh County | 091 | Eufaula | 1907 | . | Creek McIntosh family | &0000000000019456.00000019,456 | &0000000000000620.000000620 sq mi (&0000000000001606.0000001,606 km2) |  |
| Murray County | 099 | Sulphur | 1907 | . | Governor of Oklahoma William H. "Alfalfa Bill" Murray | &0000000000012623.00000012,623 | &0000000000000418.000000418 sq mi (&0000000000001083.0000001,083 km2) |  |
| Muskogee County | 101 | Muskogee | 1907 | . | Muscogee Native American people | &0000000000069451.00000069,451 | &0000000000000814.000000814 sq mi (&0000000000002108.0000002,108 km2) |  |
| Noble County | 103 | Perry | 1897 | . | U.S. Secretary of the Interior John W. Noble | &0000000000011411.00000011,411 | &0000000000000732.000000732 sq mi (&0000000000001896.0000001,896 km2) |  |
| Nowata County | 105 | Nowata | 1907 | . | The town of Nowata, Oklahoma. Its origin is unclear, but the two most common stories are that railroad surveyors used the Delaware word noweta for welcome or that a sign was posted indicating that local springs had no water: No wata | &0000000000010569.00000010,569 | &0000000000000565.000000565 sq mi (&0000000000001463.0000001,463 km2) |  |
| Okfuskee County | 107 | Okemah | 1907 | . | Creek town in Cleburn County, Alabama | &0000000000011814.00000011,814 | &0000000000000625.000000625 sq mi (&0000000000001619.0000001,619 km2) |  |
| Oklahoma County | 109 | Oklahoma City | 1891 | . | From two Choctaw words okla and humma, meaning people and red | &0000000000660448.000000660,448 | &0000000000000709.000000709 sq mi (&0000000000001836.0000001,836 km2) |  |
| Okmulgee County | 111 | Okmulgee | 1907 | . | Creek word meaning boiling water | &0000000000039685.00000039,685 | &0000000000000697.000000697 sq mi (&0000000000001805.0000001,805 km2) |  |
| Osage County | 113 | Pawhuska | 1907 | . | The Osage Indian Reservation, inhabited by the Osage Nation | &0000000000044437.00000044,437 | &0000000000002251.0000002,251 sq mi (&0000000000005830.0000005,830 km2) |  |
| Ottawa County | 115 | Miami | 1907 | . | Ottawa Native American people | &0000000000033194.00000033,194 | &0000000000000471.000000471 sq mi (&0000000000001220.0000001,220 km2) |  |
| Pawnee County | 117 | Pawnee | 1897 | . | The Skidi Pawnee Native American people | &0000000000016612.00000016,612 | &0000000000000570.000000570 sq mi (&0000000000001476.0000001,476 km2) |  |
| Payne County | 119 | Stillwater | 1890 | . | David L. Payne | &0000000000068190.00000068,190 | &0000000000000686.000000686 sq mi (&0000000000001777.0000001,777 km2) |  |
| Pittsburg County | 121 | McAlester | 1907 | . | Named for Pittsburgh, Pennsylvania | &0000000000043953.00000043,953 | &0000000000001306.0000001,306 sq mi (&0000000000003383.0000003,383 km2) |  |
| Pontotoc County | 123 | Ada | 1907 | . | Pontotoc is a Chickasaw word meaning cat tails growing on the prairie | &0000000000035143.00000035,143 | &0000000000000720.000000720 sq mi (&0000000000001865.0000001,865 km2) |  |
| Pottawatomie County | 125 | Shawnee | 1891 | . | The Pottawatomie Native American people | &0000000000065521.00000065,521 | &0000000000000788.000000788 sq mi (&0000000000002041.0000002,041 km2) |  |
| Pushmataha County | 127 | Antlers | 1907 | . | The Pushmataha District of the Choctaw Nation | &0000000000011167.00000011,167 | &0000000000001397.0000001,397 sq mi (&0000000000003618.0000003,618 km2) |  |
| Roger Mills County | 129 | Cheyenne | 1895 | . | U.S. Senator Roger Q. Mills | &0000000000003436.0000003,436 | &0000000000001142.0000001,142 sq mi (&0000000000002958.0000002,958 km2) |  |
| Rogers County | 131 | Claremore | 1907 | . | Clem V. Rogers, a member of the Oklahoma Constitutional Convention and the father of entertainer Will Rogers | &0000000000070641.00000070,641 | &0000000000000675.000000675 sq mi (&0000000000001748.0000001,748 km2) |  |
| Seminole County | 133 | Wewoka | 1907 | . | The Seminole Native American people | &0000000000024864.00000024,864 | &0000000000000632.000000632 sq mi (&0000000000001637.0000001,637 km2) |  |
| Sequoyah County | 135 | Sallisaw | 1907 | . | Cherokee leader Sequoyah | &0000000000038972.00000038,972 | &0000000000000674.000000674 sq mi (&0000000000001746.0000001,746 km2) |  |
| Stephens County | 137 | Duncan | 1907 | . | John H. Stephens, a Texas congressman and advocate of Oklahoma statehood | &0000000000042182.00000042,182 | &0000000000000877.000000877 sq mi (&0000000000002271.0000002,271 km2) |  |
| Texas County | 139 | Guymon | 1907 | . | The neighboring U.S. state of Texas | &0000000000020107.00000020,107 | &0000000000002037.0000002,037 sq mi (&0000000000005276.0000005,276 km2) |  |
| Tillman County | 141 | Frederick | 1907 | . | U.S. Senator Benjamin Tillman of South Carolina | &0000000000009287.0000009,287 | &0000000000000872.000000872 sq mi (&0000000000002258.0000002,258 km2) |  |
| Tulsa County | 143 | Tulsa | 1907 | . | The town of Tulsa, originally within the Creek Nation, Indian Territory, which in turn derives from Tulsey Town, Alabama, an old Creek settlement | &0000000000563299.000000563,299 | &0000000000000570.000000570 sq mi (&0000000000001476.0000001,476 km2) |  |
| Wagoner County | 145 | Wagoner | 1907 | . | Said to be named for Wagoner, Oklahoma, which in turn, was possibly named for Bailey P. Waggoner, attorney of the Missouri Pacific Railway Company, the line of which led to the town's establishment | &0000000000057491.00000057,491 | &0000000000000563.000000563 sq mi (&0000000000001458.0000001,458 km2) |  |
| Washington County | 147 | Bartlesville | 1907 | . | First President of the United States George Washington | &0000000000048996.00000048,996 | &0000000000000417.000000417 sq mi (&0000000000001080.0000001,080 km2) |  |
| Washita County | 149 | Cordell | 1897 | . | The Washita River | &0000000000011508.00000011,508 | &0000000000001004.0000001,004 sq mi (&0000000000002600.0000002,600 km2) |  |
| Woods County | 151 | Alva | 1893 | . | Kansas populist Sam Wood | &0000000000009089.0000009,089 | &0000000000001287.0000001,287 sq mi (&0000000000003333.0000003,333 km2) |  |
| Woodward County | 153 | Woodward | 1907 | . | Named for a Santa Fe Railway Company station named in honor of one of the company's directors, B.W. Woodward | &0000000000018486.00000018,486 | &0000000000001242.0000001,242 sq mi (&0000000000003217.0000003,217 km2) |  |