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 60139 Glendale Heights DuPage County 331, 630
IL 60140 Hampshire Kane County 224, 331, 630, 779, 815, 847
IL 60141 Hines Cook County 464, 708
IL 60142 Huntley McHenry County 224, 779, 815, 847
IL 60143 Itasca DuPage County 224, 331, 630, 847
IL 60144 Kaneville Kane County 331, 630
IL 60145 Kingston DeKalb County 779, 815
IL 60146 Kirkland DeKalb County 779, 815
IL 60147 Lafox Kane County 331, 630
IL 60148 Lombard DuPage 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.