Huetter is a city in Kootenai County, Idaho, United States. The population was 100 at the 2010 census. According to the United States Census …Huetter is a city in Kootenai County, Idaho, United States. The population was 100 at the 2010 census. According to the United States Census Bureau, the city has a total area of 0.04 square miles, all land. This makes Huetter the smallest incorporated city in the United States in terms of area.