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 60805 Evergreen Park Cook County 464, 708, 773, 872
IL 60827 Riverdale Cook County 464, 708, 773, 872
IL 60901 Kankakee Kankakee County 779, 815
IL 60910 Aroma Park Kankakee County 779, 815
IL 60911 Ashkum Iroquois County 779, 815
IL 60912 Beaverville Iroquois County 219, 779, 815
IL 60913 Bonfield Kankakee County 779, 815
IL 60914 Bourbonnais Kankakee County 779, 815
IL 60915 Bradley Kankakee County 779, 815
IL 60917 Buckingham Kankakee County 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.