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 61705 Bloomington McLean County 309
IL 61709 Bloomington Mclean County 309
IL 61710 Bloomington Mclean County 309
IL 61720 Anchor McLean County 217, 309, 447
IL 61721 Armington Tazewell County 217, 309, 447
IL 61722 Arrowsmith McLean County 309
IL 61723 Atlanta Logan County 217, 309, 447
IL 61724 Bellflower McLean County 217, 309, 447
IL 61725 Carlock McLean County 309
IL 61726 Chenoa McLean County 309, 779, 815
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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.