Bloomington is a city in Bear Lake County, Idaho, United States. The population was 206 at the 2010 census. It was first settled in 1864. A…Bloomington is a city in Bear Lake County, Idaho, United States. The population was 206 at the 2010 census. It was first settled in 1864. According to the United States Census Bureau, the city has a total area of 0.90 square miles, all of it land.