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 60001 Alden McHenry County 779, 815
IL 60002 Antioch Lake County 224, 262, 779, 815, 847
IL 60004 Arlington Heights Cook County 224, 847
IL 60005 Arlington Heights Cook County 224, 847
IL 60006 Arlington Heights Cook County 224
IL 60007 Elk Grove Village Cook County 224, 331, 630, 847
IL 60008 Rolling Meadows Cook County 224, 847
IL 60009 Elk Grove Village Cook County 224
IL 60010 Barrington Lake County 224, 847
IL 60011 Barrington Cook County 224
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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.