The Washington Common Historic District encompasses a cluster of three civic buildings and the town common in the center of Washington, New Hampshire. The town common began as a 2-acre (0.81 ha) parcel acquired in 1787, and the current town hall followed in 1789. It is a two-story wood frame building which originally served as both a civic and religious meeting house. The adjacent Gothic Revival Congregational Church was built in 1840. The third structure is the Schoolhouse, a 2+1⁄2-story two-room school built in 1883. The district was listed on the National Register of Historic Places in 1986.