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.

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Washington County ZIP Codes

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

County State ZIP Code City Area Codes
Washington County RI 02880 Wakefield 401
Washington County RI 02881 Kingston 401
Washington County RI 02882 Narragansett 401
Washington County RI 02883 Peace Dale 401
Washington County RI 02891 Westerly 401, 860, 959
Washington County RI 02892 West Kingston 401
Washington County RI 02894 Wood River Junction 401
Washington County RI 02898 Wyoming 401
Washington County TN 37601 Johnson City 423
Washington County TN 37602 Johnson City 423
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Geographic Map of Washington County

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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.