Assumption is a city in Christian County, Illinois, United States. The population was 1,155 as of the 2020 census. History Assumption originally was called "Tacusah". The present name is after Assumption Parish, Louisiana. A post office called Assumption has been operation since 1858. Assumption lays claim to the deepest coal mine (abandoned in the 1930s) in the state at over 1000' below the surface. First National Bank of Assumption (founded in 1900) claims to be the oldest bank in Christian County as it was the only bank in the county to remain open during the Great Depression. In May 2017, news reached Assumption of the recovery of the remains of United States Air Force Captain Joseph S. Smith, a pilot shot down over Cambodia in 1971 during the Vietnam War. A large portion of the community turned out for his repatriation and internment in July, 2017 Geography According to the 2020 census, Assumption has a total area of , all land. Demographics As of the census of 2020, there were 1,155 people, 551 households, and 353 families residing in the city. The population density was . There were 607 housing units at an average density of . The racial makeup of the city was 99.84% White, 0.08% Asian, and 0.08% from two or more races. Hispanic or Latino of any race were 0.16% of the population. There were 551 households, out of which 28.7% had children under the age of 18 living with them, 51.4% were married couples living together, 8.9% had a female householder with no husband present, and 35.8% were non-families. 33.2% of all households were made up of individuals, and 18.9% had someone living alone who was 65 years of age or older. The average household size was 2.29 and the average family size was 2.86. In the town the population was spread out, with 25.6% under the age of 18, 7.0% from 18 to 24, 27.0% from 25 to 44, 21.1% from 45 to 64, and 19.3% who were 65 years of age or older. The median age was 38 years. For every 100 females, there were 82.8 males. For every 100 females age 18 and over, there were 81.4 males. The median income for a household in the town was $34,474, and the median income for a family was $41,417. Males had a median income of $35,650 versus $17,292 for females. The per capita income