 It was first listed on the National Register of Historic Places in 1982.Its area was increased in 1992 to include the Hall and Bill building on North Street, built in 1889 by one of Willimantic's leading printers.The urban center of Willimantic was first settled by English colonists in 1706, when a sawmill and gristmill were erected near the junction of the Natchaug and Willimantic Rivers.