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

St. Joseph County ZIP Codes

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

County State ZIP Code City Area Codes
St. Joseph County IN 46530 Granger 269, 574
St. Joseph County IN 46536 Lakeville 574
St. Joseph County IN 46544 Mishawaka 574
St. Joseph County IN 46545 Mishawaka 574
St. Joseph County IN 46546 Mishawaka 574
St. Joseph County IN 46552 New Carlisle 219, 269, 574
St. Joseph County IN 46554 North Liberty 219, 574
St. Joseph County IN 46556 Notre Dame 574
St. Joseph County IN 46561 Osceola 574
St. Joseph County IN 46574 Walkerton 219, 574
Page 1 of 4

Geographic Map of St. Joseph 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.