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 60613 Chicago Cook County 773, 872
IL 60614 Chicago Cook County 312, 773, 872
IL 60615 Chicago Cook County 773, 872
IL 60616 Chicago Cook County 312, 773, 872
IL 60617 Chicago Cook County 219, 773, 872
IL 60618 Chicago Cook County 773, 872
IL 60619 Chicago Cook County 773, 872
IL 60620 Chicago Cook County 464, 708, 773, 872
IL 60621 Chicago Cook County 773, 872
IL 60622 Chicago Cook County 312, 773, 872
Page 36 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.