Greene is a city in Butler County, Iowa, United States, along the Shell Rock River, and along Butler County's northern border, where Butler and Floyd counties meet. The population was 990 at the time of the 2020 census. History The community of Greene was first a postal area called, "Elm Springs" that was established in 1855 three miles southwest of the current town on Coldwater Creek. In 1871, the railroad selected a site on the east side of the Shell Rock River for a train depot and roundhouse, drawing the Elm Springs Post Office and community to that site. In 1871, the postal area name was changed from Elm Springs to Greene in honor of Judge George Greene, president of the Burlington, Cedar Rapids and Minnesota railroad who, along with J. W. Traer and others, purchased the land for the new community. Judge Greene gave generously of land and money for the new town. In 1879, the Greene postal area was incorporated as The Town of Greene. Geography The city is located along the northern edge of Butler County, with a small portion extending north into Floyd County. According to the United States Census Bureau, the city has a total area of , of which is land and is water. The Shell Rock River bisects the town, with the state Highway 14 and County Road 13 bridges connecting the two sections. Demographics 2010 census As of the census of 2010, there were 1,130 people, 510 households, and 320 families living in the city. The population density was . There were 575 housing units at an average density of . The racial makeup of the city was 98.6% White, 0.2% African American, 0.2% Native American, 0.3% Asian, and 0.8% from two or more races. Hispanic or Latino of any race were 0.4% of the population. There were 510 households, of which 22.2% had children under the age of 18 living with them, 53.9% were married couples living together, 6.3% had a female householder with no husband present, 2.5% had a male householder with no wife present, and 37.3% were non-families. 33.1% of all households were made up of individuals, and 19.6% had someone living alone who was 65 years of age or older. The average household size was 2.16 and the average family size was 2.72. The median age in the city was 49.8 years. 19.4% of residents were under the