San Francisco Bay Area telephone exchanges from the late 1940s

The San Francisco Bay Area was one of the geographic areas that started dial service using the two letter, four digit pattern for telephone numbers. In the 1940s, it switched to the pattern that was at the time becoming standard, two letters and five digits, of which the first of the digits was considered part of the exchange, and the last four constituted the line number. At present, only the later period, with a 2L-5N pattern, is documented on this site, and the information available is mostly from the latter part of that era, primarily a 1960 directory. Earlier data will be added in the future. (While links to the pre-dial and early dial periods are provided, they will not provide any data at present; they are only here for future use.)

This section is organized in the same way as is each geographical section of this site: by exchange. There are three tables, which can be described as alphabetical, numeric, and alphabetical/numeric:


San Francisco Bay Area:
Main San Francisco Bay Area page
Chronological periods of the San Francisco Bay Area data:
Pre-dial period Early dial period Late dial period

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Last modified August 29, 2015.




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