{{Short description|Area codes in central Indiana}} {{Use mdy dates|date=February 2026}} {{Use American English|date=February 2026}} thumb|right|300px|Area Code map for all of Indiana '''Area codes 317 and 463''' are telephone overlay area codes in the North American Numbering Plan (NANP) for Indianapolis and nine surrounding counties in central Indiana. The numbering plan area (NPA) comprises all or parts of Marion, Boone, Hancock, Hamilton, Hendricks, Johnson, Madison, Morgan, and Shelby counties. 317 is the original area code of the NPA, created in 1947, and 463 was added to the numbering plan area in 2016, making ten-digit dialing mandatory for all calls in the region.
==History== In 1947, American Telephone and Telegraph (AT&T) published the first configuration of proposed numbering plan areas (NPAs) for a new nationwide numbering and toll call routing system. Indiana was divided into two numbering plan areas. Area code 317 served the northern two-thirds of Indiana and area code 812 served the remaining southern part. The first change of the original plan occurred in 1948, when 317 was cut back to just central Indiana, while the northern third of Indiana, including Gary, Hammond, East Chicago, South Bend, Elkhart, and Fort Wayne, received area code 219.<ref>{{Cite web |title=Indiana Area Code History |url=https://telecomindiana.com/indiana1947.html |access-date=2023-04-16 |website=Telecom Indiana}}</ref>
Despite Indianapolis's rapid growth during the second half of the 20th century and the accompanying increased number demand, this configuration remained in place for 48 years. No changes were made to 317 until February 1, 1997, when most of the 317 territory outside of the inner ring of the Indianapolis metropolitan area was assigned to area code 765.<ref>{{cite web |title=Indiana - Area Codes Implemented Since 1990 |publisher=AT&T |url=http://www.sbc.com/gen/general?pid=1718&phase=check <!--|archive-url=https://archive.today/20090212101510/http://www.att.com/gen/general?pid=1718&phase=check--> |archive-url=http://web.archive.org/web/20090212101510/http://www.att.com/gen/general?pid=1718&phase=check |archive-date=2009-02-12 |access-date=2026-02-13 }}</ref>
The proliferation of pagers and cell phones depleted the numbering resources of area code 317, so that it was expected to exhaust in 2017. The Indiana Regulatory Commission announced that area code 463 would be added in 2016 to form an overlay numbering plan. This was the second time that an area code in Indiana was overlaid, after area code 812 had been overlaid with area code 930 in March 2015.<ref>{{cite news |last1=Russell |first1=John |date=2015-04-08 |title=New area code, mandatory 10-digit dialing, come to Central Indiana |url=https://www.indystar.com/story/news/2015/04/08/new-area-code-mandatory-digit-dialing-come-central-indiana/25472009/ |access-date=2025-08-03 |work=The Indianapolis Star}}</ref>
Area code 463, which spells out ''IND'' on the alphanumeric telephone keypad, entered service on March 15, 2016. On that date, a permissive dialing period began during which both seven- and ten-digit dialing was possible. Ten-digit dialing was originally to become mandatory in the Indianapolis area on September 15, 2016.<ref>{{cite web |date=2016-06-15 |title=10-Digit Dialing in Indiana's 317 Area Code |url=https://www.in.gov/oucc/files/317-463_NR_-_10_Digit_Dialing_Update_-_6-15-16.pdf |access-date=2025-08-03 |publisher=Indiana Utility Regulatory Commission}}</ref> However, on August 31, in response to an appeal from security alarm companies, the deadline was extended to October 15, 2016.<ref>{{Cite web |date=2016-08-31 |title=Commission Extends Deadline for 10-Digit Dialing in 317 Area Code |url=https://www.in.gov/iurc/files/317-463%20news%20release%20final%2083116.pdf |url-status=dead |archive-url=https://web.archive.org/web/20170220095638/https://www.in.gov/iurc/files/317-463%20news%20release%20final%2083116.pdf |archive-date=2017-02-20 |access-date=2018-07-26 |publisher=Indiana Utility Regulatory Commission}}</ref>
==See also== *List of Indiana area codes *List of North American Numbering Plan area codes
==References== {{Reflist}}
==External links== {{Area code footer|Map=IN}}
{{Area code box | State = IN |This =317/463 | N = 765 | W = 765 | E = 765 | S = 812/930}}
{{Coord|39.768333|-86.158056|display=title|scale:200000}}
{{DEFAULTSORT:Area Code 317}} 317 317 Category:Indianapolis Category:Boone County, Indiana Category:Hamilton County, Indiana Category:Hancock County, Indiana Category:Hendricks County, Indiana Category:Henry County, Indiana Category:Johnson County, Indiana Category:Madison County, Indiana Category:Marion County, Indiana Category:Morgan County, Indiana Category:Shelby County, Indiana Category:Telecommunications-related introductions in 1947 Category:Indianapolis metropolitan area Category:Telecommunications-related introductions in 2016