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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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Clayton County ZIP Codes

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

County State ZIP Code City Area Codes
Clayton County IA 52066 North Buena Vista 563, 608
Clayton County IA 52072 Saint Olaf 563
Clayton County IA 52076 Strawberry Point 563
Clayton County IA 52077 Volga 563
Clayton County IA 52156 Luana 563
Clayton County IA 52157 Mc Gregor 563, 608
Clayton County IA 52158 Marquette 563
Clayton County IA 52159 Monona 563
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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.