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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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Mason County ZIP Codes

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

County State ZIP Code City Area Codes
Mason County MI 49458 Walhalla 231
Mason County TX 76820 Art 325
Mason County TX 76842 Fredonia 325
Mason County TX 76856 Mason 325, 830
Mason County TX 76869 Pontotoc 325
Mason County WA 98524 Allyn 253, 360, 564
Mason County WA 98528 Belfair 253, 360, 564
Mason County WA 98546 Grapeview 253, 360, 564
Mason County WA 98548 Hoodsport 360, 564
Mason County WA 98555 Lilliwaup 360, 564
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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.