Union is a town in Tolland County, Connecticut. The population was 854 at the 2010 census, making it the least populous town in Connecticut and the second-least populous municipality in Connecticut; only the Borough of Fenwick has fewer people. Union includes the village of Mashapaug located in the Eastern Uplands at the Massachusetts state line.
According to the United States Census Bureau, the town has a total area of 29.8 square miles (77 km2), of which 28.7 square miles (74 km2) is land and 1.1 square miles (2.8 km2) (3.75%) is water.
Union has the highest town center in eastern Connecticut at 1,015' and the 4th highest in the state. The highest elevation in eastern Connecticut is 1,315' Burley Hill in the northwest part of town. In addition, I-84 reaches its highest elevation in Connecticut (1,002') in Union.
Approximately one-third of the town is state park land, including Bigelow Hollow State Park, Nipmuck State Forest and the Mountain Laurel Sanctuary. A portion of the Yale-Myers Forest and Hull Foresters are located in Union. All combined, there are nearly 34,000 acres of forestland in Union.
Mashapaug Lake is a large lake in Union. The lake is used for fishing, boating, and swimming.
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