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U.S. ZIP Codes Database 2026

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Oconto County ZIP Codes

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

County State ZIP Code City Area Codes
Oconto County WI 54101 Abrams 920
Oconto County WI 54124 Gillett 534, 715, 920
Oconto County WI 54138 Lakewood 534, 715
Oconto County WI 54139 Lena 534, 715, 920
Oconto County WI 54141 Little Suamico 920
Oconto County WI 54149 Mountain 534, 715, 920
Oconto County WI 54153 Oconto 534, 715, 920
Oconto County WI 54154 Oconto Falls 534, 715, 920
Oconto County WI 54171 Sobieski 920
Oconto County WI 54174 Suring 534, 715, 920
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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.