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
County directory

Stephenson County ZIP Codes

Browse all ZIP Codes, cities, and associated area codes registered in Stephenson County.

County State ZIP Code City Area Codes
Stephenson County IL 61062 Pearl City 779, 815
Stephenson County IL 61067 Ridott 779, 815
Stephenson County IL 61070 Rock City 608, 779, 815
Stephenson County IL 61089 Winslow 608, 779, 815
Page 2 of 2

Geographic Map of Stephenson County

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.