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is a town in Worcester County, Massachusetts, United States. The population was 2,724 at the 2000 census. It is formally a part of the Providence metropolitan area.
Millville was first settled in 1662, and officially incorporated in 1916 by division from Blackstone, Massachusetts (which had itself originally been part of Mendon, Massachusetts).
Millville is in the Blackstone River Valley National Heritage Corridor and has a well preserved lock which was used on the Blackstone Canal in the early 1800s. It also has a historic Friends Meetinghouse. In the first two decades of the 20th century, baseball great Gabby Hartnett, born in Woonsocket, grew up here and played for the Chicago Cubs, beginning in 1922.