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 60173 Schaumburg Cook County 224, 847
IL 60174 Saint Charles Kane County 224, 331, 630, 847
IL 60175 Saint Charles Kane County 224, 331, 630, 847
IL 60176 Schiller Park Cook County 224, 773, 847, 872
IL 60177 South Elgin Kane County 224, 331, 630, 847
IL 60178 Sycamore DeKalb County 224, 331, 630, 779, 815, 847
IL 60179 Hoffman Estates Cook County 224
IL 60180 Union McHenry County 224, 779, 815, 847
IL 60181 Villa Park DuPage County 331, 630
IL 60183 Wasco Kane County 331, 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.