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 62343 Hull Pike County 217, 447, 573
IL 62344 Huntsville Schuyler County 217, 447
IL 62345 Kinderhook Pike County 217, 447
IL 62346 La Prairie Adams County 217, 447
IL 62347 Liberty Adams County 217, 447
IL 62348 Lima Adams County 217, 447
IL 62349 Loraine Adams County 217, 447
IL 62351 Mendon Adams County 217, 447
IL 62352 Milton Pike County 217, 447
IL 62353 Mount Sterling Brown County 217, 447
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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.