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CALIFORNIA STATE TELEPHONE CENTRAL OFFICE'S
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AREA CODE 510
Area code 510 was split from the original 415 area code in September 1991, and established to provide telephone coverage for the East Bay and Oakland areas due to the tremendous amount of new cellular, fax and pager service requests. It is interesting to note, that the 510 code was originally used for AT&T's TeletypeWriter eXchange (TWX) service. This service was acquired by Western Union in 1969, and additional "10" codes were added to help define geographic areas. The special TWX codes were decommissioned in 1981, when Western Union upgraded to ASCII transmission.
 ALAMEDA (Thanks to AB) | Original Pacific
Telephone & Telegraph-->Pacific Bell-->SBC--> now AT&T office.
Serves the island community which was once home to the Alameda Naval Air
Station. Old Exchanges: LAkehurst 1, 2 and 3. |
 BERKELEY |
Original Pacific Telephone & Telegraph-->Pacific Bell-->SBC--> now AT&T office. Serves the dense City of Berkley as well as the University of California Berkley campus. Old Exchanges: AShbury 3, BErekley 7, THornwall 1, 3, 5, 8 and 9. |
 CROCKETT (Thanks to AB) Original Pacific
Telephone & Telegraph-->Pacific Bell-->SBC--> now AT&T office built in the
1920s to serve the industrial city which is home to a C&H Sugar factory.
Remote switch hosted by El Sobrante. |
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 EL SOBRANTE (Thanks to AB) |
Original Pacific Telephone & Telegraph-->Pacific Bell-->SBC--> now AT&T
office built in the 1950s to serve the growing bedroom community north of
Oakland. Serves as the host for the Crockett office. Old Exchanges: CApital 3 and PLymouth 8 |
 FREMONT 11 "MAIN" (Thanks to AB) |
Original Pacific Telephone & Telegraph-->Pacific
Bell-->SBC--> now AT&T office. Old Exchanges: SYcamore 3 and 7 |
 FREMONT 12 "ADAMS" (Thanks to AB) |
Original Pacific Telephone & Telegraph-->Pacific
Bell-->SBC--> now AT&T office built in the late 1950s to relieve
the Fremont Main office. Old Exchanges: OLiver 6 |
 HAYWARD 01 "MAIN" |
Original Pacific Telephone & Telegraph-->Pacific
Bell-->SBC--> now AT&T office built in the 1930s. Old Exchanges: JEfferson 7 and 8, LUcerene 1 and 2. |
 HAYWARD 11 "DEPOT ROAD" |
Original Pacific
Telephone & Telegraph-->Pacific Bell-->SBC--> now AT&T office
built in the 1960s to serve the growing western portion of the city. Old Exchanges: SUset 2 and 3 |
 HERCULES (Thanks to AB) |
Original Pacific Telephone & Telegraph-->Pacific
Bell-->SBC--> now AT&T office built in the 1960s to serve this growing
bedroom and industrial community north of Oakland. |
 OAKLAND 03 "FRANKLIN" |
Original Pacific
Telephone & Telegraph-->Pacific Bell-->SBC--> now AT&T office.
This is the "Big" one.
See OAKLAND 03
Old Exchanges: ROchester 7 (Time Announcement), CRestview1 and 3, GLencourt 1 and 2, HIghgate 4, TEmplebar 2, 4, 5 and 6, TWinoaks 3 |
 OAKLAND 04 "FRUITVALE" (Thanks to AB) |
Original Pacific Telephone & Telegraph-->Pacific Bell-->SBC--> now AT&T
office built in the 1910s. Office has been expanded over the years with
additional stories. Old Exchanges: ANdover 1, KEllog 2, 3, 4 and 6. |
 OAKLAND 11 "45TH STREET" (Thanks to AB) |
Original Pacific Telephone & Telegraph-->Pacific Bell-->SBC--> now AT&T
office built in the 1920s to relieve the Franklin office. Old Exchnages: HUmboldt 3, OLympic 2, 3 ,4 5, and 8 |
 OAKLAND 12 "HOLLY STREET" (Thanks to AB) |
Original Pacific Telephone & Telegraph-->Pacific Bell-->SBC--> now AT&T
office built in the 1920s to relieve the Fruitvale office and provide
service to the southern Oakland areas. As evidence by the steel plates over
the old window openings, this office is in a rather rough neighborhood. Old Exhcnages: LOckhaven 2, 8 and 9, NEptune 2, 6 and 8, SWeetwood 8, TRinadad 2 and 3. |
 OAKLAND 13 "MOUNTAIN" |
Original Pacific Telephone & Telegraph-->Pacific Bell-->SBC--> now AT&T office built in the 1960s to relieve the Fruitvale and 45th Street offices and provide services to the growing Piedmont area to the east of Oakland. |
 RICHMOND (Thanks to AB) |
Original Pacific Telephone & Telegraph-->Pacific Bell-->SBC--> now AT&T
office built in the 1910s and added on to over the years. An old Pacific
Telephone logo "imprint" still remains near entrance door even after some 40
years! Old Exchanges: BEacon 2, 3, 4 and 5 |
 SAN LEANDRO 11 |
Original Pacific Telephone & Telegraph-->Pacific Bell-->SBC--> now AT&T
office. Old Exchanges: BRowing 6, 7 and 8, ELgin 1 and 7 |
 UNION CITY (Thanks to AB) |
Original
Pacific Telephone & Telegraph-->Pacific Bell-->SBC--> now AT&T office
recently expanded and remodeled. Old Exchanges: GReenleaf 1 |
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