Area code 318

Area code 318 is a telephone area code in the North American Numbering Plan (NANP) for the northern and central parts of the U.S. state of Louisiana.

Area code 318 as of 1999.

The area code was created in 1957 in a split of Louisiana's original area code 504. Originally, it covered nearly all of the state west of the Mississippi River, stretching from the Gulf of Mexico north to the border with Arkansas. In 1999, the southern half of the "original" 318, including Lafayette and Lake Charles, became area code 337.

Further relief will be required by 2025 (with Louisiana's first overlay), as 318 is expected to exhaust by early 2026.[1] The relief area code will be area code 457.[2][3] The exact relief date has not yet been determined, although a transition to ten-digit dialing will be required before relief is implemented.

Service area

Prior use

During the initial trials of direct distance dialing (DDD) in 1951, the code 318 had been temporarily assigned as a destination code for San Francisco. Oakland and San Francisco had separate toll switches, so that calls had to be routed accordingly depending on the final destination. As the telephone equipment used at the time handled only three-digit translation, the temporary use of a distinct area code was required to distinguish between the two Bay Area cities. Area code 318 was used temporarily to specify San Francisco and areas north of the Golden Gate Bridge, while calls with destinations in Oakland or the East Bay used area code 415. When the electromechanical card-translator became available by 1953, translations using six digits were possible; the 318 code no longer was required. The entire San Francisco Bay Area returned to using area code 415. In 1991, area code 510 split off from 415. By 2015, area code 628 was added in an overlay.

See also

References
  1. "2023-1 NRUF and NPA Exhaust Analysis" (PDF). North American Numbering Plan Administrator. April 21, 2023. Retrieved July 15, 2021.
  2. https://www.nationalnanpa.com/enas/plannedNpasNotInServiceReport.do. {{cite web}}: Missing or empty |title= (help)
  3. https://www.lpsc.louisiana.gov/docs/press/318%20PR%20final.pdf
Louisiana area codes: 225, 318, 337, 504, 985
North: 870
West: 409, 430/903, 936 area code 318 East: 601/769, 662
South: 225, 337
Arkansas area codes: 479, 501, 870
Mississippi area codes: 228, 601/769, 662
Texas area codes: 210/726, 214/469/972, 254, 281/346/713/832, 325, 361, 409, 430/903, 432, 512/737, 682/817, 806, 830, 915, 936, 940, 956, 979

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