Plainfield, New Hampshire 03781
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Plainfield is a town in Sullivan County. The town is home to the Helen Woodruff Smith Bird Sanctuary and Annie Duncan State Forest.
The town has a total area of 52.9 square miles. Bounded on the west by the Connecticut River, Plainfield is drained by Blood’s Brook and Blow-me-down Brook. Croydon Mountain is a high ridge that occupies the eastern edge of the town. Grantham Mountain, a peak along the ridge, is the highest point in Plainfield at 2,660 feet above sea level.
The town is crossed by the north-south NH-12A and NH-120. NH-12A, serving the western part of the town, passes through the village of Plainfield. NH-120, passing through the eastern part of the town, serves the village of Meriden.