Area codes 213 and 323 - Wikipedia
https://en.wikipedia.org/wiki/Area_codes_213_and_323
In 1947, when 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: 213, 415, and 916, for the southern, central, and northern parts of the state, respectively. The area served by 213 extended from the Mexican border to the Central Coast. In 1950, the boundary between 213 and 415 was realigned toward the …
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