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 60048 Libertyville Lake County 224, 847
IL 60049 Lake Zurich Lake County 224, 847
IL 60050 Mchenry McHenry County 224, 779, 815, 847
IL 60051 Mchenry McHenry County 224, 779, 815, 847
IL 60053 Morton Grove Cook County 224, 847
IL 60055 Palatine Cook County 224
IL 60056 Mount Prospect Cook County 224, 847
IL 60060 Mundelein Lake County 224, 847
IL 60061 Vernon Hills Lake County 224, 847
IL 60062 Northbrook Cook County 224, 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.