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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Illinois ZIP Codes

Complete postal directory, details, and geographic map for the State of Illinois.

State ZIP Code City County Area Codes
IL 62365 Plainville Adams County 217, 447
IL 62366 Pleasant Hill Pike County 217, 447, 573
IL 62367 Plymouth Hancock County 217, 309, 447
IL 62370 Rockport Pike County 217, 447, 573
IL 62373 Sutter Hancock County 217, 447
IL 62374 Tennessee McDonough County 217, 309, 447
IL 62375 Timewell Brown County 217, 447
IL 62376 Ursa Adams County 217, 447
IL 62378 Versailles Brown County 217, 447
IL 62379 Warsaw Hancock County 217, 319, 447, 573, 660
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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.