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2. List of North American Numbering Plan area codes - Wikipedia

   en.wikipedia.org/wiki/List_of_North_American...

   Created conflicts in area code regions that allowed seven-digit dialling and had been using numbers beginning in 988; a total of 82 area codes switched to ten-digit dialling as a result. 989: Michigan (Alpena, Mt. Pleasant, Bay City, Saginaw, Midland, Owosso, and a part of central Michigan) April 7, 2001: split of 517; 990–999

3. List of California area codes - Wikipedia

   en.wikipedia.org/wiki/List_of_California_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, respectively. [1] As of July 2023, California has 38 active area codes. Stockton, Modesto, Merced, Turlock; the northern San Joaquin Valley and the central Sierra ...

4. Area codes 416, 647, and 437 - Wikipedia

   en.wikipedia.org/wiki/Area_codes_416,_647,_and_437

   A new overlay area code, 437, started operation on March 25, 2013. That effectively allocates 24 million numbers to a city of 2.5 million people. Area code 942 is scheduled for addition to the 416/647/437 overlay on April 26, 2025. Area code 387 has been reserved for Toronto's future use.

5. Category:Area codes in the United States - Wikipedia

   en.wikipedia.org/wiki/Category:Area_codes_in_the...

   Area codes 205 and 659. Area code 206. Area code 207. Area codes 208 and 986. Area codes 209 and 350. Area codes 210 and 726. Area codes 212, 646, and 332. Area codes 213 and 323. Area codes 214, 469, 972, and 945.

6. Area codes 916 and 279 - Wikipedia

   en.wikipedia.org/wiki/Area_codes_916_and_279

   Area code 916 was one of the first three original area codes established in California in October 1947. It originally covered most of Northern California, but area code splits have reduced its coverage to the greater Sacramento area. Area code 279 began service in March 2018 to relieve an exhausted supply of telephone numbers in the 916 area code.

7. Area codes 602, 480, and 623 - Wikipedia

   en.wikipedia.org/wiki/Area_codes_602,_480,_and_623

   Area codes 602, 480, and 623 are telephone area codes in the North American Numbering Plan (NANP) for most of the Phoenix metropolitan area in the U.S. state of Arizona . Area code 602 is the oldest area code in Arizona and was assigned in 1947 for the entire state. Under pressure from population growth and new telecommunications services, the ...