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
All states and U.S. territories
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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 61415 Avon Fulton County 309
IL 61416 Bardolph McDonough County 309
IL 61417 Berwick Warren County 309
IL 61418 Biggsville Henderson County 309
IL 61419 Bishop Hill Henry County 309
IL 61420 Blandinsville McDonough County 217, 309, 447
IL 61421 Bradford Stark County 309
IL 61422 Bushnell McDonough County 309
IL 61423 Cameron Warren County 309
IL 61424 Camp Grove Marshall County 309
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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.