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 60150 Malta DeKalb County 779, 815
IL 60151 Maple Park Kane County 224, 331, 630, 779, 815, 847
IL 60152 Marengo McHenry County 224, 779, 815, 847
IL 60153 Maywood Cook County 464, 708
IL 60154 Westchester Cook County 331, 464, 630, 708
IL 60155 Broadview Cook County 464, 708
IL 60156 Lake In The Hills McHenry County 224, 779, 815, 847
IL 60157 Medinah DuPage County 331, 630
IL 60159 Schaumburg Cook County 224
IL 60160 Melrose Park Cook County 224, 464, 708, 847
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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.