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Telephone Area Code History
Los Angeles County

History of Los Angeles County Area Codes (Overlay Codes are in Green). Los Angeles Almanac Map.

Year Area Code Serving Area
October 1947 213 All of Los Angeles County
1957 805 Ventura, Santa Barbara, San Luis Obispo, Bakersfield, Northern L.A. County (former 213)
1984 818 San Gabriel Valley, San Fernando Valley (former 213)
1991 310 Western, Eastern, & Southern L.A. County (former 213)
1992 909 Riverside, San Bernardino (former 714)
January 1997 562 Eastern L.A. County, Long Beach (former 310)
June 1997 626 San Gabriel (former 818)
June 1998 323 Los Angeles (former 213)
February 1999 661 Northern L.A. County including the Santa Clarita and Antelope Valleys (former 805)
July 2006 424 Overlay for Western L.A. County, Catalina Island (added to 310 region)
May 2009 747 Overlay for San Fernando Valley/West-Central L.A. County (added to 818 region)

The former telephone company GTE (merged into Verizon) once inadvertantly published a telephone directory for Sierra Madre listing no home numbers.

In 1958, due to increased consumer demand for individual telephone numbers, the telephone company began phasing out old exchange names for all numeric telephone numbers or "All Number Calling" (pretty much gone by 1963). These old exchange names are remembered in Glenn Miller’s song PEnnsylvania 6-5000 and Elizabeth Taylor’s movie BUtterfield-8.
List of numbers for Los Angeles County gleaned from exchange names collected by the Telephone EXchange Name Project