Sinclair is an unincorporated community located in the U.S. state of Maine. It is within Aroostook County in the Square Lake along Maine State Route 162 and the western shore of Long Lake. It coordinates at 47°10′00″N 68°16′10″W. The elevation is 591 feet above sea level. Recent job growth is negatively decreased by 2.35 percent. The average travel time is 17 minutes. It has Zip code 04779.