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 60184 Wayne DuPage County 224, 331, 630, 847
IL 60185 West Chicago DuPage County 331, 630
IL 60186 West Chicago Dupage County 630
IL 60187 Wheaton DuPage County 331, 630
IL 60188 Carol Stream DuPage County 331, 630
IL 60189 Wheaton DuPage County 331, 630
IL 60190 Winfield DuPage County 331, 630
IL 60191 Wood Dale DuPage County 224, 331, 630, 847
IL 60192 Hoffman Estates Cook County 224, 331, 630, 847
IL 60193 Schaumburg Cook County 224, 331, 630, 847
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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.