Because telephone exchanges in the entire San Francisco Bay area, including San Francisco, Oakland, San Jose, and many smaller communities, were closely connected, a single section of this Website is intended to cover the entire area. (See the map below, which defines the local calling area in 1960, though very similar maps would have been available much earlier.) The history of the telephone exchange names in the Bay Area, as in most significant United States cities, can be divided into three periods:
At this time, I have no information about the Bay Area exchanges in the pre-dial period and only a very small amount of information in the early dial period. There is more information on the late dial period, mostly thanks to Alan J. Sachs, who provided both new data and links to additional data. To access this information click here. (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.)
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Last modified August 30, 2015.