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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Fairfax City ZIP Codes

Browse all ZIP Codes, cities, and associated area codes registered in Fairfax City.

County State ZIP Code City Area Codes
Fairfax City VA 22034 Fairfax 571
Fairfax City VA 22036 Fairfax 571, 703
Fairfax City VA 22037 Fairfax 571
Fairfax City VA 22038 Fairfax 571

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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.