The Mill River is a tributary of the Saint George River in Thomaston, Maine. From the confluence (44°05′57″N 69°10′03″W / 44.0993°N 69.1674°W / 44.0993; -69.1674 (Mill River source)) of Branch Brook and Meadow Brook, the river runs 2.7 miles (4.3 km)[1] south to the head of the estuary of the Saint George.
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