Area codes 317 and 463 are

North American Numbering Plan The North American Numbering Plan (NANP) is a 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 and has the international calling ...

area codes 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, re ...

for Indianapolis and nine surrounding counties in central

Indiana Indiana () is a U.S. state in the Midwestern United States. It is the 38th-largest by area and the 17th-most populous of the 50 States. Its capital and largest city is Indianapolis. Indiana was admitted to the United States as the 19th ...

. It covers all or part of Marion, Boone, Hancock, Hamilton, Hendricks,

Johnson Johnson is a surname of Anglo-Norman origin meaning "Son of John". It is the second most common in the United States and 154th most common in the world. As a common family name in Scotland, Johnson is occasionally a variation of ''Johnston'', a ...

Madison Madison may refer to: People * Madison (name), a given name and a surname * James Madison (1751–1836), fourth president of the United States Place names * Madison, Wisconsin, the state capital of Wisconsin and the largest city known by this ...

Morgan Morgan may refer to: People and fictional characters * Morgan (given name), including a list of people and fictional characters * Morgan le Fay, a powerful witch in Arthurian legend * Morgan (surname), a surname of Welsh origin * Morgan (singer), ...

, and Shelby counties. 317 is the original area code, while 463 is an overlay covering the same area, making

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

mandatory for all calls in the region.

History

In 1947,

American Telephone and Telegraph AT&T Corporation, originally the American Telephone and Telegraph Company, is the subsidiary of AT&T Inc. that provides voice, video, data, and Internet telecommunications and professional services to businesses, consumers, and government agen ...

(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 the ...

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 and the county seat of St. Joseph County, Indiana, on the St. Joseph River near its southernmost bend, from which it derives its name. As of the 2020 census, the city had a total of 103,453 residents and is the fourt ...

, Elkhart and Fort Wayne, 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 Indianapolis–Carmel–Anderson or Indianapolis metropolitan area is an 11-county metropolitan area in the U.S. state of Indiana, as defined by the Office of Management and Budget. The metropolitan area is situated in Central Indiana, within ...

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' ...

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 Year 317 ( CCCXVII) was a common year starting on Tuesday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Gallicanus and Bassus (or, less frequently, year 1070 ''Ab urbe c ...

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