It is one of two such installations in Indiana. The remaining two interchanges, Exit 99 - Main Street and Exit 101 - County Line Road, use conventional diamond and parclo A4 configurations, respectively. All three interchanges serve major commercial and industrial zones in the city. Freight rail service is provided by the Louisville and Indiana Railroad (LIRC). The LIRC line traverses Greenwood from north to south and roughly parallels U.S. 31 and Interstate 65. As of the census of 2010, there were 49,791 people, 19,615 households, and 12,845 families residing in the city. The population density was . There were 21,339 housing units at an average density of . The racial makeup of the city was 91.1% White, 1.7% African American, 0.3% Native American, 3.7% Asian, 0.1% Pacific Islander, 2.1% from other races, and 2.1% from two or more races. Hispanic or Latino of any race were 4.0% of the population. There were 19,615 households of which 35.7% had children under the age of 18 living with them, 49.2% were married couples living together, 11.6% had a female householder with no husband present, 4.8% had a male householder with no wife present, and 34.5% were non-families. 27.8% of all households were made up of individuals and 8.9% had someone living alone who was 65 years of age or older. The average household size was 2.51 and the average family size was 3.09. The median age in the city was 34 years. 26.6% of residents were under the age of 18; 9% were between the ages of 18 and 24; 29.8% were from 25 to 44; 23.1% were from 45 to 64; and 11.6% were 65 years of age or older. The gender makeup of the city was 48.4% male and 51.6% female. As of the census of 2000, there were 36,037 people, 14,931 households, and 9,600 families residing in the city. The population density was 2,524.8 people per square mile (975.0/km²). There were 16,042 housing units at an average density of 1,123.9 per square mile (434.0/km²). The racial makeup of the city was 96.54% White, 0.44% African American, 0.19% Native American, 1.36% Asian, 0.04% Pacific Islander, 0.69% from other races, and 0.74% from two or more races.