Area code 925 covers certain areas of Bay Area - a subdivision of California. A study of history reveals that area code 925 was part of area code 415 in 1947 when there were only three area codes - code 415, code 213 and code 916 covering all the central California.
Area codes divided into further areas and allotted with different area codes because of the ever increasing demands of telephone. Majority people need to have dialup as well telephone working at the same time - such scenarios make it obligatory to divide regions and assign different codes to all divisions.
Majority of the Oakland Metropolitan Statistical Area was allocated under code 510 in 1991. However in 1998 area 510 split into area code 925. Areas served by the code 925 use Pacific Time Zone.
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