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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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Polk County ZIP Codes

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

County State ZIP Code City Area Codes
Polk County TX 77350 Leggett 936
Polk County TX 77351 Livingston 281, 346, 409, 713, 832, 936
Polk County TX 77360 Onalaska 936
Polk County TX 77399 Livingston 936
Polk County WI 54001 Amery 534, 715
Polk County WI 54004 Clayton 534, 715
Polk County WI 54005 Clear Lake 534, 715
Polk County WI 54006 Cushing 534, 715
Polk County WI 54009 Dresser 534, 651, 715
Polk County WI 54020 Osceola 534, 651, 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.