U.S. postal lookup

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.

42,735 verified records
All states and U.S. territories
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State directory

Illinois ZIP Codes

Complete postal directory, details, and geographic map for the State of Illinois.

State ZIP Code City County Area Codes
IL 62091 Walshville Montgomery County 217, 447
IL 62092 White Hall Greene County 217, 447
IL 62093 Wilsonville Macoupin County 217, 447, 618
IL 62094 Witt Montgomery County 217, 447
IL 62095 Wood River Madison County 618, 636
IL 62097 Worden Madison County 618
IL 62098 Wrights Greene County 217, 447
IL 62201 East Saint Louis St. Clair County 314, 557, 618
IL 62202 East Saint Louis St. Clair County 618
IL 62203 East Saint Louis St. Clair County 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.