Imogene is a city in Fremont County, Iowa, United States. The population was 39 at the time of the 2020 census. According to the United Stateā¦Imogene is a city in Fremont County, Iowa, United States. The population was 39 at the time of the 2020 census. According to the United States Census Bureau, the city has a total area of 0.20 square miles, all land.