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 60467 Orland Park Cook County 464, 708
IL 60468 Peotone Will County 464, 708, 779, 815
IL 60469 Posen Cook County 464, 708
IL 60470 Ransom LaSalle County 779, 815
IL 60471 Richton Park Cook County 464, 708
IL 60472 Robbins Cook County 464, 708
IL 60473 South Holland Cook County 464, 708
IL 60474 South Wilmington Grundy County 779, 815
IL 60475 Steger Will County 464, 708
IL 60476 Thornton Cook County 464, 708
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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.