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Its southern terminus is at the U.S. Route 36/State Route 3 concurrency in Sunbury, and its northern terminus is at U.S. Route 6 east of Huron, at the southernmost point of Lake Erie (which is subsequently the southernmost northern border of the United States).
The portion of Tara Boulevard in Clayton County that is not covered by US 19/US 41 and SR 3 near Interstate 75 is designated as State Route 3 Connector.
State Route 3 is part of Maine's system of numbered state highways, running from Route 8, 11 and 27 in Augusta to an intersection with Route 102 in the village of Somesville in the town of Mount Desert, on Mount Desert Island.