Area codes 317 and 463 are telephone

area code A telephone numbering plan is a type of numbering scheme used in telecommunication to assign telephone numbers to subscriber telephones or other telephony endpoints. Telephone numbers are the addresses of participants in a telephone network, rea ...

s in the

North American Numbering Plan The North American Numbering Plan (NANP) is an integrated telephone numbering plan for twenty-five regions in twenty countries, primarily in North America and the Caribbean. This group is historically known as World Zone 1, World Numbering Zone ...

(NANP) for

Indianapolis Indianapolis ( ), colloquially known as Indy, is the List of capitals in the United States, capital and List of municipalities in Indiana, most populous city of the U.S. state of Indiana and the county seat of Marion County, Indiana, Marion ...

and nine surrounding counties in central

Indiana Indiana ( ) is a U.S. state, state in the Midwestern United States, Midwestern region of the United States. It borders Lake Michigan to the northwest, Michigan to the north and northeast, Ohio to the east, the Ohio River and Kentucky to the s ...

. The numbering plan area (NPA) comprises all or parts of

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, Boone, Hancock,

Hamilton Hamilton may refer to: * Alexander Hamilton (1755/1757–1804), first U.S. Secretary of the Treasury and one of the Founding Fathers of the United States * ''Hamilton'' (musical), a 2015 Broadway musical by Lin-Manuel Miranda ** ''Hamilton'' (al ...

, Hendricks,

Johnson Johnson may refer to: People and fictional characters *Johnson (surname), a common surname in English * Johnson (given name), a list of people * List of people with surname Johnson, including fictional characters *Johnson (composer) (1953–2011) ...

, Madison,

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, and Shelby counties. 317 is the original area code of the NPA, created in 1947, while 463 is an overlay code for the same area that was added in 2016, making

ten-digit dialing Ten-digit dialing is a telephone dialing procedure in the countries and territories of the North American Numbering Plan (NANP). It is the practice of including the area code of a telephone number when Dialling (telephony), dialing to initiate a t ...

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 to receive two area codes. Area code 317 served the northern two-thirds of Indiana, while

area code 812 Area codes 812 and 930 are telephone area codes in the North American Numbering Plan (NANP) for the southern third of the state of Indiana. The numbering plan area (NPA) includes Evansville and most of its suburbs, the Indiana portions of t ...

served the southern third. In the first change of the original plan in 1948, 317 was cut back to central Indiana, while the northern third of Indiana, including Gary, Hammond, East Chicago,

South Bend South Bend is a city in St. Joseph County, Indiana, United States, and its county seat. It lies along the St. Joseph River (Lake Michigan), St. Joseph River near its southernmost bend, from which it derives its name. It is the List of cities in ...

, Elkhart and

Fort Wayne Fort Wayne is a city in Allen County, Indiana, United States, and its county seat. Located in northeastern Indiana, the city is west of the Ohio border and south of the Michigan border. The city's population was 263,886 at the 2020 United S ...

, received area code 219. 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 old 317 territory outside of the inner ring of the

Indianapolis metropolitan area The Indianapolis metropolitan area is an 11-county metropolitan area in the U.S. state of Indiana. Its principal cities are Indianapolis, Carmel, Indiana, Carmel, Greenwood, Indiana, Greenwood, and Anderson, Indiana, Anderson. Other primary cit ...

switched to 765. 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. The new area code, which spells out IND on a standard telephone keypad, made 317 the second Indiana area code to be overlaid after

was overlaid with 930 in March 2015. Area code 463 entered service on March 15, 2016. On that date, a

permissive dialing In North America, permissive dialing is the ability to make phone calls in an area subject to a newly introduced area code by using both the new and preexisting dialing methods. When an area is given a new area code under a split plan, the area's ...

period began during which both seven- and ten-digit calls would be able to complete. Ten-digit dialing was originally to become mandatory in the Indianapolis area on September 15, 2016. However, on August 31, in response to an appeal from security alarm companies, the deadline was extended to October 15, 2016.

References

External links

List of exchanges from AreaCodeDownload.com, 317 Area Code
{{DEFAULTSORT:Area Code 317 317 317 Indianapolis Boone County, Indiana Hamilton County, Indiana Hancock County, Indiana Hendricks County, Indiana Henry County, Indiana Johnson County, Indiana Madison County, Indiana Marion County, Indiana Morgan County, Indiana Shelby County, Indiana Telecommunications-related introductions in 1947 Indianapolis metropolitan area Telecommunications-related introductions in 2016

History

See also

References

External links