There are 38 US Post Offices in Aroostook County serving a total of 70,550 residents equating to 1,857 residents per post office. It's estimated that approximately 112,606 packages are handled across the 38 county post offices annually. Aroostook County is a county located in the U.S. state of Maine along the Canada\u2013US border. As of the 2010 census, the population was 71,870. Its seat is Houlton. Known locally in Maine simply as \"The County,\" it is the largest American county by land area east of the Rocky Mountains (St. Louis County, Minnesota is larger by total area) and the largest county by total area in Maine. As Maine's northernmost county, its northernmost village, Estcourt Station, is therefore also the northernmost community in New England and in the contiguous United States east of the Great Lakes. Aroostook County is known for its potato crops, as well as its Acadian culture. In the Saint John Valley in the northern part of the county, which borders Madawaska County, New Brunswick, many of the residents are bilingual in English and Acadian French. Elsewhere in Maine, New England French is the predominant form of French spoken (apart from standard French). The county is also an emerging hub for wind power."