Hillsgrove (originally Hill's Grove) is an area in western central Warwick, Rhode Island. The area was established as a farming hamlet and later a mill village, but today it is dominated by the presence of T. F. Green Airport, Rhode Island's largest and most important airport. Leviton Manufacturing operated a large factory here, fabricating electronic components for many years. Post Road (U.S. Route 1), which runs through the area, is heavily commercialized with fast food restaurants, car rental locations, and hotels supporting the airport.