As of the census of 2000, there were 22,542 people, 9,306 households, and 6,123 families residing in the city. By 2008, that number had jumped to 25,942. The population density was 361.6/km (936.6/mi). There were 10,043 housing units at an average density of 161.1/km² (417.3/mi²). The racial makeup of the city was 86.04% White, 9.70% African American, 0.30% Native American, 1.89% Asian, 0.06% Pacific Islander, 0.56% from other races, and 1.46% from two or more races. Hispanics or Latinos of any race were 1.79% of the population.
There were 9,306 households out of which 32.5% had children under the age of 18 living with them, 48.3% were married couples living together, 13.9% had a female householder with no husband present, and 34.2% were non-traditional or mixed families. 30.2% of all households were made up of individuals and 10.8% had someone living alone who was 65 years of age or older. The average household size was 2.33 and the average family size was 2.89.
The age distribution was 24.9% under the age of 18, 9.0% from 18 to 24, 30.8% from 25 to 44, 21.3% from 45 to 64, and 14.0% who were 65 years of age or older. The median age was 36 years. For every 100 females there were 91.5 males. For every 100 females age 18 and over, there were 86.5 males.
The median income for a household in the city was $35,823, and the median income for a family was $45,399. Males had a median income of $32,406 versus $23,709 for females. The per capita income for the city was $20,442. About 8.5% of families and 10.5% of the population were below the poverty line, including 14.6% of those under age 18 and 9.1% of those age 65 or over.
In 2000, Hardin County, Kentucky and Larue County, Kentucky were defined as the Elizabethtown, KY Metropolitan Statistical Area by the Bureau of the Census. It is part of the Louisville-Jefferson County-Elizabethtown-Scottsburg, KY-IN Combined Statistical Area.
The city is served by the Elizabethtown Regional Airport (EKX) and the Elizabethtown Airport Board is currently exploring options to bring commercial services to the city.