Approximate service area of Area Code 317 is in red.

Area code 317 is a North American Numbering Plan area code for Central Indiana. It serves most of the Indianapolis Metropolitan Service Area, including all of Indianapolis/Marion County and portions of the surrounding counties, Boone, Hancock, Hamilton, Hendricks, Johnson, Madison, Morgan, and Shelby.

[edit] History

Originally, 317 covered all of Northern and Central Indiana and area code 812 covered Southern Indiana. However, in the first split of the area code system since its inception, Northern Indiana split off as area code 219 in 1948. Eventually, population growth and increased number demand necessitated another split. Beginning on February 1, 1997, with mandatory dialing effective June 28, the greater Indianapolis area retained 317 and the remainder of Central Indiana split off into area code 765.^[1]

[edit] See also

• List of NANP area codes

[edit] References

[edit] External links

• NANPA Area Code Map of Indiana
• List of exchanges from AreaCodeDownload.com, 317 Area Code