Geography
Casey is located at 39°17′58″N, 87°59′24″W (39.299543, -87.990056).
According to the United States Census Bureau, the city has a total area of 2.1 square miles (5.5 km²), all of it land.
 
Demographics
As of the census of 2000, there were 2,942 people, 1,266 households, and 758 families residing in the city. The population density was 1,385.0 people per square mile (535.8/km²). There were 1,454 housing units at an average density of 684.5/sq mi (264.8/km²) 87.The racial makeup of the city was 98.67% White, 0.4% African American, 0.14% Native American, 0.03% from other races, and 0.71% from two or more races. Hispanic or Latino of any race were 0.24% of the population.
 There were 1,266 households out of which 28.2% had children under the age of 18 living with them, 44.4% were married couples living together, 12.2% had a female householder with no husband present, and 40.1% were non-families. 36.7% of all households were made up of individuals and 20.2% had someone living alone who was 65 years of age or older. The average household size was 2.22 and the average family size was 2.90.
 In the city the population was spread out with 24.1% under the age of 18, 7.9% from 18 to 24, 24.1% from 25 to 44, 20.7% from 45 to 64, and 23.2% who were 65 years of age or older. The median age was 40 years. For every 100 females there were 80.3 males. For every 100 females age 18 and over, there were 74.5 males.
 The median income for a household in the city was $30,089, and the median income for a family was $36,941. Males had a median income of $30,809 versus $16,496 for females. The per capita income for the city was $16,266. About 11.5% of families and 15.4% of the population were below the poverty line, including 20.6% of those under age 18 and 10.1% of those age 65 or over.