In 1879, the community was founded with the name Clarksville. Its post office was established in 1880, and the city later incorporated in 1885 as Alexandria. The city was named after Alexander Mitchell.
As of the census of 2010, there were 615 people, 231 households, and 171 families residing in the city. The population density was. There were 249 housing units at an average density of. The racial makeup of the city was 98.5% White, 0.5% Asian, 0.7% from other races, and 0.3% from two or more races. Hispanic or Latino of any race were 1.6% of the population. There were 231 households of which 35.1% had children under the age of 18 living with them, 66.7% were married couplesliving together, 4.8% had a female householder with no husband present, 2.6% had a male householder with no wife present, and 26.0% were non-families. 23.8% of all households were made up of individuals and 9.9% had someone living alone who was 65 years of age or older. The average household size was 2.66 and the average family size was 3.11. The median age in the city was 37.5 years. 28.3% of residents were under the age of 18; 6.3% were between the ages of 18 and 24; 26.5% were from 25 to 44; 26.3% were from 45 to 64; and 12.8% were 65 years of age or older. The gender makeup of the city was 49.8% male and 50.2% female.
2000 census
As of the census of 2000, there were 563 people, 234 households, and 146 families residing in the city. The population density was 1,041.9 people per square mile. There were 251 housing units at an average density of 464.5 per square mile. The racial makeup of the city was 99.29% White, 0.18% Native American, 0.18% Asian, and 0.36% from two or more races. Hispanic or Latino of any race were 0.18% of the population. There were 234 households out of which 32.5% had children under the age of 18 living with them, 58.5% were married couples living together, 3.4% had a female householder with no husband present, and 37.2% were non-families. 34.2% of all households were made up of individuals and 20.1% had someone living alone who was 65 years of age or older. The average household size was 2.41 and the average family size was 3.15. In the city, the population was spread out with 27.5% under the age of 18, 7.5% from 18 to 24, 27.5% from 25 to 44, 20.4% from 45 to 64, and 17.1% who were 65 years of age or older. The median age was 38 years. For every 100 females, there were 102.5 males. For every 100 females age 18 and over, there were 94.3 males. The median income for a household in the city was $31,875, and the median income for a family was $45,333. Males had a median income of $30,500 versus $19,500 for females. The per capita income for the city was $16,120. About 2.8% of families and 6.2% of the population were below the poverty line, including 3.8% of those under age 18 and 9.7% of those age 65 or over. 1880–82, photo April 5, 1902
