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
All states and U.S. territories
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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 60522 Hinsdale Dupage County 773, 224, 708, 312, 630, 847
IL 60523 Oak Brook DuPage County 331, 464, 630, 708
IL 60525 La Grange Cook County 331, 464, 630, 708
IL 60526 La Grange Park Cook County 331, 464, 630, 708
IL 60527 Willowbrook DuPage County 331, 464, 630, 708
IL 60530 Lee Lee County 779, 815
IL 60531 Leland LaSalle County 779, 815
IL 60532 Lisle DuPage County 331, 630
IL 60534 Lyons Cook County 464, 708
IL 60536 Millbrook Kendall County 331, 630, 779, 815
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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.