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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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Nicollet County ZIP Codes

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

County State ZIP Code City Area Codes
Nicollet County MN 56003 Mankato 507
Nicollet County MN 56021 Courtland 507
Nicollet County MN 56054 Lafayette 507
Nicollet County MN 56074 Nicollet 507
Nicollet County MN 56082 Saint Peter 507

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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.