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U.S. ZIP Codes Database 2026

Search by ZIP code, city, county, or state and find clear postal details with maps, time zones, and area code data.

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San Diego County ZIP Codes

Browse all ZIP Codes, cities, and associated area codes registered in San Diego County.

County State ZIP Code City Area Codes
San Diego County CA 91935 Jamul 619, 858
San Diego County CA 91941 La Mesa 619, 858
San Diego County CA 91942 La Mesa 619, 858
San Diego County CA 91943 La Mesa 619
San Diego County CA 91944 La Mesa 619
San Diego County CA 91945 Lemon Grove 619, 858
San Diego County CA 91946 Lemon Grove 619
San Diego County CA 91947 Lincoln Acres 619
San Diego County CA 91948 Mount Laguna 442, 619, 760, 858
San Diego County CA 91950 National City 619, 858
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About U.S. ZIP Codes

ZIP codes are a United States Postal Service system introduced in 1963 to make mail routing more accurate and efficient. The standard format uses five digits, while ZIP+4 adds four more digits for a more precise delivery segment.

ZIP codes cover the United States, its territories, military mail routes, and other USPS delivery points. This directory organizes that data for practical lookup by ZIP code, city, county, and state.