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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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Humboldt County ZIP Codes

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

County State ZIP Code City Area Codes
Humboldt County CA 95501 Eureka 707
Humboldt County CA 95502 Eureka 707
Humboldt County CA 95503 Eureka 707
Humboldt County CA 95511 Alderpoint 707
Humboldt County CA 95514 Blocksburg 707
Humboldt County CA 95518 Arcata 707
Humboldt County CA 95519 Mckinleyville 707
Humboldt County CA 95521 Arcata 707
Humboldt County CA 95524 Bayside 707
Humboldt County CA 95525 Blue Lake 707
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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.