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 60064 North Chicago Lake County 224, 847
IL 60065 Northbrook Cook County 224
IL 60067 Palatine Cook County 224, 847
IL 60068 Park Ridge Cook County 224, 773, 847, 872
IL 60069 Lincolnshire Lake County 224, 847
IL 60070 Prospect Heights Cook County 224, 847
IL 60071 Richmond McHenry County 262, 779, 815
IL 60072 Ringwood McHenry County 779, 815
IL 60073 Round Lake Lake County 224, 779, 815, 847
IL 60074 Palatine Cook County 224, 847
Page 6 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.