Forts in the United States

Fort Bragg is an installation of the United States Army and is the largest military base in the world (by population) with more than 50,000 active duty personnel.

Fort McClary is a former defensive fortification of the United States military located along the southern coast of Maine at Kittery Point.

Castle Clinton or Fort Clinton, once known as Castle Garden, is a circular sandstone fort now located in Battery Park, in Manhattan, New York City.

Fort Knox, now Fort Knox State Park or Fort Knox State Historic Site, is located on the western bank of the Penobscot River in the town of Prospect, Maine, about 5 miles (8.0 km) from the mouth of the river.

Fort Western is a former British colonial outpost at the head of navigation on the Kennebec River at modern Augusta, Maine, United States.

Fort Gorges is a former United States military fort built on Hog Island Ledge in Casco Bay, Maine.

Fort Pontchartrain du Détroit or Fort Detroit was a fort established by the French officer Antoine de la Mothe Cadillac in 1701.

Fort Christina (later renamed Fort Altena; Swedish: Fort Kristina) was the first Swedish settlement in North America and the principal settlement of the New Sweden colony.

Fort Mackinac (pronounced: MACK-in-awe) is a former British and American military outpost garrisoned from the late 18th century to the late 19th century in the city of Mackinac Island, Michigan, on Mackinac Island.

Fort William Henry was a British fort at the southern end of Lake George in the province of New York.

Fort Jefferson is a massive but unfinished coastal fortress.

Fort Knox is a United States Army post in Kentucky south of Louisville and north of Elizabethtown.

Fort Halifax is a former British colonial outpost on the banks of the Sebasticook River, just above its mouth at the Kennebec River, in Winslow, Maine.

Fort George G. Meade is a United States Army installation that includes the Defense Information School, the Defense Media Activity, the United States Army Field Band, and the headquarters of United States Cyber Command, the National Security Agency, the Defense Courier Service, and Defense Information Systems Agency headquarters.