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When the original North American area codes were introduced for a nationwide telephone numbering plan in 1947, the entire state was a single numbering plan area (NPA) with area code 305. In 1953, area code 813 was introduced for the western coast of Florida, and 904 was assigned for northern Florida in 1965.
The additional demands for PCS and cellular phone numbers helped necessitate the 831/408 area code split, the 650/415 split, and the earlier 510/415 split. Part of the previous dialing plan included a mass calling prefix for radio station contests, introduced in the 1960s because some contests put unacceptable loads on the Bay Area's telephone ...
The North American Numbering Plan (NANP) divides the territories of its members into geographic numbering plan areas (NPAs). Each NPA is identified by one or more numbering plan area codes (NPA codes, or area codes), consisting of three digits that are prefixed to each local telephone number having seven digits.
Overlay complexes are used to add central office prefixes in an NPA to increase the number of available telephone numbers. [1] Overlay area codes ... 408: Southern ...
On March 1, 1959, area code 707 was created from the northern part, and area code 408 was created for San Jose, the South Bay, the Monterey Bay, and the Salinas Valley. [5] (408 has since been split to 831 and overlaid with 669.) On September 2, 1991, area code 510 was created for the East Bay, including Oakland.
Telephone dial number card of c.1948 with the local telephone number 4-5876 in Atlantic City, NJ, using the central office prefix 4, later converted to AT4 Face of a 1939 rotary telephone dial with the telephone number LA-2697, which includes the first two letters of Lakewood, New Jersey, as the central office prefix, later converted to LA6.
Area code 407 was created in 1988 in a split of area code 305, [1] Florida's original area code of 1947. When assigned, 407 included not only most of Central Florida, but also the Palm Beaches and Treasure Coast. In 1996, Palm Beach, Martin, Indian River, and St. Lucie counties were split from the number plan area and received area code 561.
Original NANP area codes of Florida and surrounding states. In 1947, the American Telephone and Telegraph Company (AT&T) announced the first nationwide telephone numbering plan and divided the United States and Canada into 86 numbering plan areas and assigned the original North American area codes, a unique code for each area, to speed the connection times for operator toll dialing.