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
Maps and coordinates
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 62781 Springfield Sangamon County 217
IL 62786 Springfield Sangamon County 217
IL 62791 Springfield Sangamon County 217
IL 62794 Springfield Sangamon County 217
IL 62796 Springfield Sangamon County 217
IL 62801 Centralia Marion County 618
IL 62803 Hoyleton Washington County 618
IL 62805 Akin Franklin County 618
IL 62806 Albion Edwards County 618
IL 62807 Alma Marion County 618
Page 142 of 159

Geographic Map of Illinois

Postal context

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.