Coös County, New Hampshire

Coös County (, with two syllables), frequently spelled Coos County, is a county in the state of New Hampshire, in the United States. As of the 2020 census, the population was 31,268, the least of any New Hampshire county. The county seat is Lancaster.

Coös County was founded	in 1803.

 References 

Category:19th-century establishments in New Hampshire
Category:1803 establishments in the United States
Category:New Hampshire counties