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 61367 Sublette Lee County 779, 815
IL 61368 Tiskilwa Bureau County 309, 779, 815
IL 61369 Toluca Marshall County 309, 779, 815
IL 61370 Tonica LaSalle County 779, 815
IL 61371 Triumph LaSalle County 779, 815
IL 61372 Troy Grove LaSalle County 779, 815
IL 61373 Utica LaSalle County 779, 815
IL 61374 Van Orin Bureau County 779, 815
IL 61375 Varna Marshall County 309
IL 61376 Walnut Bureau County 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.