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 60118 Dundee Kane County 224, 847
IL 60119 Elburn Kane County 331, 630, 779, 815
IL 60120 Elgin Cook County 224, 331, 630, 847
IL 60121 Elgin Kane County 224
IL 60122 Carol Stream Dupage County 630
IL 60123 Elgin Kane County 224, 847
IL 60124 Elgin Kane County 224, 331, 630, 847
IL 60125 Carol Stream Dupage County 630
IL 60126 Elmhurst DuPage County 331, 464, 630, 708
IL 60128 Carol Stream 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.