California by the Codes

Every kind of business is done, on or through the telephone these days, so it is only natural to see California geographically through area codes. The headquarters of publicly held companies listed on the major exchanges are concentrated in urban areas, of course, with strong concentrations in Silicon Valley and San Francisco. Southern California, true to its soul, has about the same number of companies but they are spread over a larger area.

Telephone area code: (707)

Number of company headquarters: 11

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Telephone area code: (916)

Number of company headquarters: 20

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Telephone area code: (415) (San Francisco)

Number of company headquarters: 193

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Telephone area code: (510)

Number of company headquarters: 90

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Telephone area code: (408) (Silicon Valley)

Number of company headquarters: 211

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Telephone area code: (209)

Number of company headquarters: 4

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Telephone area code: (805)

Number of company headquarters: 42

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Telephone area code: (818)

Number of company headquarters: 111

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Telephone area code: (310)

Number of company headquarters: 118

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Telephone area code: (213) (Los Angeles)

Number of company headquarters: 41

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Telephone area code: (714) (Orange County)

Number of company headquarters: 142

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Telephone area code: (909) (San Diego)

Number of company headquarters: 20

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Telephone area code: (619)

Number of company headquarters: 114

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Note: New 1997 area codes not separated. (562 is part of 310, and 760 is part of 619.) Area codes and general regions they cover: 916, Sacramento and northern valleys; 707, Santa Rosa, Napa and north coast; 415, San Francisco and Marin counties; 408, San Jose and Silicon Valley area; 510, Oakland and East Bay; 209, Fresno and Central Valley; 805, Ventura, Santa Barbara and central coast; 213, central Los Angeles; 310, western and southern Los Angeles County; 714, Orange County; 818, San Fernando and San Gabriel valleys; 909, western Riverside and San Bernardino counties; 619, San Diego County and desert areas.

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Source: Market Guide headquarters data as of April 11, 1997