Thurman is a city in Fremont County, Iowa. As of the 2020 census, the city population was 167. On April 14, 2012, a half-mile wide EF-2 tornad…Thurman is a city in Fremont County, Iowa. As of the 2020 census, the city population was 167. On April 14, 2012, a half-mile wide EF-2 tornado struck Thurman. The storm damaged 75 to 90 percent of its homes. Five tractor-trailers traveling on Interstate 29 were flipped before the tornado hit Thurman. One driver suffered a perforated lung and was taken to a hospital.