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 61060 Orangeville Stephenson County 608, 779, 815
IL 61061 Oregon Ogle County 779, 815
IL 61062 Pearl City Stephenson County 779, 815
IL 61063 Pecatonica Winnebago County 779, 815
IL 61064 Polo Ogle County 779, 815
IL 61065 Poplar Grove Boone County 608, 779, 815
IL 61067 Ridott Stephenson County 779, 815
IL 61068 Rochelle Ogle County 779, 815
IL 61070 Rock City Stephenson County 608, 779, 815
IL 61071 Rock Falls Whiteside County 779, 815
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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.