New Hampshire Genealogy Trails!
Formed in 1803
Coos County was separated from the northern part of Grafton County, New Hampshire and organized at Berlin December 24, 1803, although the county seat was later moved to Lancaster, with an additional shire town at Colebrook. The name Coos derives from the Algonquian Indian term meaning crooked, the Indian name of the Connecticut River, which rises in the northernmost end of the county
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