Houlton is a town in and the county seat of Aroostook County, Maine, United States, on the Canada–United States border. As of the 2020 census, the town's population was 6,055. It is perhaps best known for being at the northern terminus of Interstate 95 and as the birthplace of Samantha Smith, a goodwill ambassador as a child during the Cold War. The town hosts the annual Houlton Agricultural Fair.