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 60447 Minooka Grundy County 331, 630, 779, 815
IL 60448 Mokena Will County 464, 708, 779, 815
IL 60449 Monee Will County 464, 708, 779, 815
IL 60450 Morris Grundy County 779, 815
IL 60451 New Lenox Will County 464, 708, 779, 815
IL 60452 Oak Forest Cook County 464, 708
IL 60453 Oak Lawn Cook County 464, 708, 773, 872
IL 60454 Oak Lawn Cook County 708
IL 60455 Bridgeview Cook County 464, 708
IL 60456 Hometown Cook County 464, 708, 773, 872
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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.