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In 1947, the American Telephone and Telegraph Company (AT&T) devised the first nationwide telephone numbering plan and assigned the original North American area codes. The state of California was divided into three numbering plan areas (NPAs) with distinct area codes: 213, 415, and 916, for the southern, central, and northern parts of the state ...
Area code 603 is the sole area code for the U.S. state of New Hampshire in the North American Numbering Plan ... 214 Errol: Coös: January 14, 2000 215 Berlin: Coös ...
214: Texas (Dallas metropolitan area) ... recombined with 480 and 623 into an overlay complex for the Phoenix metropolitan area; 603: ... California's 40th area code ...
The current area code is “in high demand” and is expected to be depleted by September 2025. An overlay “adds a second area code to the same geographic region.”
0–9. Area codes 209 and 350; Area codes 213, 323, and 738; Area codes 310 and 424; Area codes 408 and 669; Area codes 415 and 628; Area codes 510 and 341
Oct. 31—CONCORD — Facing a need for another as soon as 2027, state officials are mobilizing to keep 603 as New Hampshire's only area code while warning of the disruptions a second area code ...