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

Coos County ZIP Codes

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

County State ZIP Code City Area Codes
Coos County NH 03570 Berlin 207, 603
Coos County NH 03575 Bretton Woods 603
Coos County NH 03576 Colebrook 603, 802
Coos County NH 03579 Errol 207, 468, 603, 819, 873
Coos County NH 03581 Gorham 207, 603
Coos County NH 03582 Groveton 603, 802
Coos County NH 03583 Jefferson 603
Coos County NH 03584 Lancaster 603, 802
Coos County NH 03588 Milan 603
Coos County NH 03589 Mount Washington 603
Page 1 of 3

Geographic Map of Coos 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.