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 62311 Augusta Hancock County 217, 309, 447
IL 62312 Barry Pike County 217, 447
IL 62313 Basco Hancock County 217, 447
IL 62314 Baylis Pike County 217, 447
IL 62316 Bowen Hancock County 217, 309, 447
IL 62319 Camden Schuyler County 217, 309, 447
IL 62320 Camp Point Adams County 217, 447
IL 62321 Carthage Hancock County 217, 447
IL 62323 Chambersburg Pike County 217, 447
IL 62324 Clayton Adams 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.