U.S. postal lookup

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.

42,735 verified records
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California ZIP Codes

Complete postal directory, details, and geographic map for the State of California.

State ZIP Code City County Area Codes
CA 95448 Healdsburg Sonoma County 707
CA 95449 Hopland Mendocino County 707
CA 95450 Jenner Sonoma County 707
CA 95451 Kelseyville Lake County 707
CA 95452 Kenwood Sonoma County 707
CA 95453 Lakeport Lake County 707
CA 95454 Laytonville Mendocino County 707
CA 95456 Little River Mendocino County 707
CA 95457 Lower Lake Lake County 530, 707
CA 95458 Lucerne Lake County 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.