Fort Johnston was a British fort, later a United States Army post, in Brunswick County, North Carolina on Moore Street near Southport, North Carolina. It stands on the west bank of the Cape Fear River, four miles above its mouth.

Brunswick County is a county located in the U.S. state of North Carolina. It is the southernmost county in the state. As of the 2020 census, the population was 136,693. Its population was only 73,143 in 2000, making it one of the fastest-growing counties in the state. With a nominal growth rate of approximately 47% in ten years, much of the growth is centered in the eastern section of the county in the suburbs of Wilmington such as Leland, Belville and Southport. The county seat is Bolivia, which at a population of around 150 people is among the least populous county seats in the state.