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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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St. Clair County ZIP Codes

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

County State ZIP Code City Area Codes
St. Clair County IL 62207 East Saint Louis 618
St. Clair County IL 62208 Fairview Heights 618
St. Clair County IL 62220 Belleville 618
St. Clair County IL 62221 Belleville 618
St. Clair County IL 62222 Belleville 618
St. Clair County IL 62223 Belleville 618
St. Clair County IL 62224 Mascoutah 618
St. Clair County IL 62225 Scott Air Force Base 618
St. Clair County IL 62226 Belleville 618
St. Clair County IL 62232 Caseyville 618
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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.