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 60022 Glencoe Cook County 224, 847
IL 60025 Glenview Cook County 224, 847
IL 60026 Glenview Cook County 224, 847
IL 60029 Golf Cook County 224, 847
IL 60030 Grayslake Lake County 224, 847
IL 60031 Gurnee Lake County 224, 847
IL 60033 Harvard McHenry County 262, 779, 815
IL 60034 Hebron McHenry County 262, 779, 815
IL 60035 Highland Park Lake County 224, 847
IL 60037 Fort Sheridan Lake 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.