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 62819 Buckner Franklin County 618
IL 62820 Burnt Prairie White County 618
IL 62821 Carmi White County 618, 812, 930
IL 62822 Christopher Franklin County 618
IL 62823 Cisne Wayne County 618
IL 62824 Clay City Clay County 618
IL 62825 Coello Franklin County 618
IL 62827 Crossville White County 618, 812, 930
IL 62828 Dahlgren Hamilton County 618
IL 62829 Dale Hamilton County 618
Page 144 of 159

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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.