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is a town in Carroll County, New Hampshire, United States. The population was 604 at the 2000 census.
Settled in 1726 by Scottish-Irish immigrants, the town was first named Coleraine. Fertile ground made it popular with farmers. It was later renamed Brookfield, after Brookfield, Massachusetts, and made a part of Middleton. But in 1785 Brookfield petitioned, unsuccessfully, to be set off from Middleton. This was due to the division of the original town of Middleton into two parts by the long, high ridge of
, then a considerable obstacle to travel. Town meetings, traditionally held in the muddy season of March, were particularly difficult to attend for those beyond the ridge. In 1794, however, permission was granted, and Brookfield incorporated. And in 1840, when Carroll County was set off from Strafford County, Brookfield went with Carroll, and Middleton remained with Strafford.