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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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Mason County ZIP Codes

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

County State ZIP Code City Area Codes
Mason County IL 61532 Forest City 217, 309, 447
Mason County IL 61546 Manito 309
Mason County IL 61567 Topeka 309
Mason County IL 62617 Bath 217, 309, 447
Mason County IL 62633 Easton 217, 309, 447
Mason County IL 62644 Havana 309
Mason County IL 62655 Kilbourne 217, 309, 447
Mason County IL 62664 Mason City 217, 309, 447
Mason County IL 62682 San Jose 217, 309, 447
Mason County KY 41034 Dover 606
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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.