Cincinnati is a city in Appanoose County, Iowa, United States. The population was 290 in the 2020 census, a decline from 428 in 2000. Geography Cincinnati's longitude and latitude coordinatesin decimal form are 40.630309, −92.923734. According to the United States Census Bureau, the city has a total area of , all land. The assigned ZIP code of the city is 52549. History Cincinnati was platted in 1855. The town of Cincinnati was incorporated in February 1875, and named for the Ohio hometown of early resident J.H.B. Armstrong. Cincinnati was a coal mining camp, and as with many coal camps in the late 19th century, it was a hotbed of union activity, strikes and occasional violence. Company E of the Second Regiment of the Iowa National Guard was called up on April 12, 1895, in response to a request of support from the county sheriff after threats of violence from striking miners in Cincinnati. In 1912, Local 775 of the United Mine Workers based in Cincinnati, had 302 members. Demographics 2010 census As of the census of 2010, there were 357 people, 159 households, and 98 families living in the city. The population density was . There were 184 housing units at an average density of . The racial makeup of the city was 97.5% White, 0.3% Asian, and 2.2% from two or more races. Hispanic or Latino of any race were 1.1% of the population. There were 159 households, of which 23.3% had children under the age of 18 living with them, 49.1% were married couples living together, 8.2% had a female householder with no husband present, 4.4% had a male householder with no wife present, and 38.4% were non-families. 31.4% of all households were made up of individuals, and 15.1% had someone living alone who was 65 years of age or older. The average household size was 2.25 and the average family size was 2.85. The median age in the city was 44.4 years. 19.9% of residents were under the age of 18; 7.6% were between the ages of 18 and 24; 23.5% were from 25 to 44; 29.7% were from 45 to 64; and 19.3% were 65 years of age or older. The gender makeup of the city was 50.1% male and 49.9% female. 2000 census As of the census of 2000, there were 428 people, 180 households, and 113 families living in the city. The population density