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

Iron County ZIP Codes

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

County State ZIP Code City Area Codes
Iron County WI 54547 Mercer 534, 715, 906
Iron County WI 54550 Montreal 534, 715
Iron County WI 54559 Saxon 534, 715, 906
Iron County WI 54565 Upson 534, 715
Page 4 of 4

Geographic Map of Iron 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.