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
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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 62044 Greenfield Greene County 217, 447, 618
IL 62045 Hamburg Calhoun County 217, 447, 573, 618
IL 62046 Hamel Madison County 618
IL 62047 Hardin Calhoun County 217, 447, 618
IL 62048 Hartford Madison County 314, 557, 618, 636
IL 62049 Hillsboro Montgomery County 217, 447
IL 62050 Hillview Greene County 217, 447, 618
IL 62051 Irving Montgomery County 217, 447
IL 62052 Jerseyville Jersey County 618
IL 62053 Kampsville Calhoun County 217, 447, 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.