Marne (pronunciation [marni]) is a city in Cass County, Iowa, United States. The population was 110 at the time of the 2020 census. History Marne got its beginnings when, in 1875, German investors from a settlement in Davenport, Iowa filed papers and plotted land purchased from Thomas Meredith. The city's name is taken from that of Marne, Germany. Geography Marne is located at (41.448586, -95.111919). According to the United States Census Bureau, the city has a total area of , all land. Demographics 2010 census As of the census of 2010, there were 120 people, 52 households, and 37 families residing in the city. The population density was . There were 64 housing units at an average density of . The racial makeup of the city was 99.2% White and 0.8% from two or more races. There were 52 households, of which 25.0% had children under the age of 18 living with them, 57.7% were married couples living together, 7.7% had a female householder with no husband present, 5.8% had a male householder with no wife present, and 28.8% were non-families. 25.0% of all households were made up of individuals, and 3.8% had someone living alone who was 65 years of age or older. The average household size was 2.31 and the average family size was 2.78. The median age in the city was 44 years. 21.7% of residents were under the age of 18; 8.4% were between the ages of 18 and 24; 22.4% were from 25 to 44; 37.4% were from 45 to 64; and 10% were 65 years of age or older. The gender makeup of the city was 48.3% male and 51.7% female. 2000 census As of the census of 2000, there were 149 people, 62 households, and 39 families residing in the city. The population density was . There were 68 housing units at an average density of . The racial makeup of the city was 97.32% White, 0.67% Native American, and 2.01% from two or more races. There were 62 households, out of which 32.3% had children under the age of 18 living with them, 53.2% were married couples living together, 8.1% had a female householder with no husband present, and 35.5% were non-families. 32.3% of all households were made up of individuals, and 11.3% had someone living alone who was 65 years of age or older. The average household size was 2.40 and