2020 census As of the
2020 census, Casey had a population of 2,404, with 1,054 households and 745 families residing in the city. The population density was . There were 1,233 housing units at an average density of . The median age was 43.5 years. 21.5% of residents were under the age of 18 and 23.8% of residents were 65 years of age or older. For every 100 females there were 86.2 males, and for every 100 females age 18 and over there were 80.7 males age 18 and over. Of the city's households, 26.7% had children under the age of 18 living in them. 41.7% were married-couple households, 19.1% were households with a male householder and no spouse or partner present, and 31.3% were households with a female householder and no spouse or partner present. About 35.4% of all households were made up of individuals, and 17.2% had someone living alone who was 65 years of age or older. Of the 1,233 housing units, 14.5% were vacant. The homeowner vacancy rate was 4.2% and the rental vacancy rate was 9.5%.
Income and poverty The median income for a household in the city was $45,784, and the median income for a family was $52,310. Males had a median income of $37,592 versus $25,369 for females. The
per capita income for the city was $26,020. About 7.8% of families and 8.1% of the population were below the
poverty line, including 8.5% of those under age 18 and 5.3% of those age 65 or over. ==Education==