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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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Riverside County ZIP Codes

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

County State ZIP Code City Area Codes
Riverside County CA 92595 Wildomar 951
Riverside County CA 92596 Winchester 951
Riverside County CA 92599 Perris 951
Riverside County CA 92860 Norco 951
Riverside County CA 92877 Corona 951
Riverside County CA 92878 Corona 951
Riverside County CA 92879 Corona 951
Riverside County CA 92880 Corona 657, 714, 840, 909, 951
Riverside County CA 92881 Corona 657, 714, 951
Riverside County CA 92882 Corona 951
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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.