Assumption is a city in Christian County, Illinois, United States. The population was 1,155 as of the 2020 census. Assumption originally w…Assumption is a city in Christian County, Illinois, United States. The population was 1,155 as of the 2020 census. Assumption originally was called "Tacusah". The present name is after Assumption Parish, Louisiana. A post office called Assumption has been in operation since 1858. Assumption lays claim to the deepest coal mine in the state at over 1000' below the surface. First National Bank of Assumption 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.
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