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 60209 Evanston Cook County 224
IL 60290 Chicago Cook County 312
IL 60301 Oak Park Cook County 464, 708
IL 60302 Oak Park Cook County 464, 708, 773, 872
IL 60303 Oak Park Cook County 708
IL 60304 Oak Park Cook County 464, 708, 773, 872
IL 60305 River Forest Cook County 464, 708, 773, 872
IL 60399 Wood Dale Dupage County 630
IL 60401 Beecher Will County 219, 464, 708, 779, 815
IL 60402 Berwyn 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.