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 62380 West Point Hancock County 217, 447
IL 62401 Effingham Effingham County 217, 447
IL 62410 Allendale Wabash County 618, 812, 930
IL 62411 Altamont Effingham County 217, 447, 618
IL 62413 Annapolis Crawford County 217, 447, 618
IL 62414 Beecher City Effingham County 217, 447, 618
IL 62417 Bridgeport Lawrence County 618
IL 62418 Brownstown Fayette County 618
IL 62419 Calhoun Richland County 618
IL 62420 Casey Clark 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.