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 60129 Esmond DeKalb County 779, 815
IL 60130 Forest Park Cook County 464, 708
IL 60131 Franklin Park Cook County 224, 331, 464, 630, 708, 773, 847, 872
IL 60132 Carol Stream Dupage County 630
IL 60133 Hanover Park Cook County 224, 331, 630, 847
IL 60134 Geneva Kane County 331, 630
IL 60135 Genoa DeKalb County 779, 815
IL 60136 Gilberts Kane County 224, 847
IL 60137 Glen Ellyn DuPage County 331, 630
IL 60138 Glen Ellyn Dupage County 630
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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.