Unionville is a city in Appanoose County, Iowa, United States. The population was 75 at the time of the 2020 census. It has a post office which is open two hours per day (11:45 AM through 1:45 PM) Monday through Saturday. History Unionville claims to be the oldest settlement in Appanoose County; the first settles arrived in 1843 and the first school was built in 1846. J. F. Stratton surveyed Unionville in 1848 on land "near the old dragoon trail, the Mormon trail". Unionville was founded in 1849. The city's name most likely commemorates the federal union. Unionville was incorporated as a city in 1922. Geography Unionville is located at (40.818515, -92.694443). 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 102 people, 49 households, and 29 families living in the city. The population density was . There were 60 housing units at an average density of . The racial makeup of the city was 100.0% White. Hispanic or Latino of any race were 3.9% of the population. There were 49 households, of which 26.5% had children under the age of 18 living with them, 46.9% were married couples living together, 8.2% had a female householder with no husband present, 4.1% had a male householder with no wife present, and 40.8% were non-families. 36.7% of all households were made up of individuals, and 12.3% had someone living alone who was 65 years of age or older. The average household size was 2.08 and the average family size was 2.66. The median age in the city was 51.8 years. 17.6% of residents were under the age of 18; 7% were between the ages of 18 and 24; 18.6% were from 25 to 44; 40.2% were from 45 to 64; and 16.7% were 65 years of age or older. The gender makeup of the city was 49.0% male and 51.0% female. 2000 census As of the census of 2000, there were 127 people, 50 households, and 38 families living in the city. The population density was . There were 68 housing units at an average density of . The racial makeup of the city was 100.00% White. There were 50 households, out of which 38.0% had children under the age of 18 living with them, 64.0% were married couples living together, 8.0% had