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U.S. ZIP Codes Database 2026

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St. Croix County ZIP Codes

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

County State ZIP Code City Area Codes
St. Croix County WI 54002 Baldwin 534, 715
St. Croix County WI 54007 Deer Park 534, 715
St. Croix County WI 54013 Glenwood City 534, 715
St. Croix County WI 54015 Hammond 534, 715
St. Croix County WI 54016 Hudson 534, 651, 715
St. Croix County WI 54017 New Richmond 534, 715
St. Croix County WI 54023 Roberts 534, 715
St. Croix County WI 54025 Somerset 534, 651, 715
St. Croix County WI 54027 Wilson 534, 715
St. Croix County WI 54028 Woodville 534, 715
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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.