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 61126 Rockford Winnebago County 815
IL 61130 Loves Park Winnebago County 815
IL 61131 Loves Park Winnebago County 815
IL 61132 Loves Park Winnebago County 815
IL 61201 Rock Island Rock Island County 309, 563
IL 61204 Rock Island Rock Island County 309
IL 61230 Albany Whiteside County 309, 563, 779, 815
IL 61231 Aledo Mercer County 309
IL 61232 Andalusia Rock Island County 309
IL 61233 Andover Henry County 309
Page 58 of 159

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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.