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 60107 Streamwood Cook County 224, 331, 630, 847
IL 60108 Bloomingdale DuPage County 331, 630
IL 60109 Burlington Kane County 224, 779, 815, 847
IL 60110 Carpentersville Kane County 224, 847
IL 60111 Clare DeKalb County 779, 815
IL 60112 Cortland DeKalb County 779, 815
IL 60113 Creston Ogle County 779, 815
IL 60115 Dekalb DeKalb County 779, 815
IL 60116 Carol Stream Dupage County 630
IL 60117 Bloomingdale 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.