US-40, passing through the northern limits of Greenfield with access from Exit 104. I-70 leads east to Richmond near the Ohio border and west through Indianapolis to Terre Haute. Indiana State Road 9 (State Street) crosses US-40 in the center of Greenfield and leads north to Pendleton and south to Shelbyville. According to the 2010 census, Greenfield has a total area of , of which (or 99.12%) is land and (or 0.88%) is water. Located on the east side of historic downtown lies Riley Park, in which flows the Brandywine Creek, a south-flowing tributary of the Big Blue River and part of the watershed of the East Fork White River. Demographics 2010 census As of the census of 2010, there were 20,602 people, 7,983 households, and 5,382 families living in the city. The population density was . There were 8,818 housing units at an average density of . The racial makeup of the city was 96.6% White, 0.6% African American, 0.3% Native American, 0.8% Asian, 0.4% from other races, and 1.3% from two or more races. Hispanic or Latino of any race were 1.8% of the population. There were 7,983 households, of which 36.8% had children under the age of 18 living with them, 49.2% were married couples living together, 12.8% had a female householder with no husband present, 5.4% had a male householder with no wife present, and 32.6% were non-families. 26.8% 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 2.51 and the average family size was 3.04. The median age in the city was 35.6 years. 26.4% of residents were under the age of 18; 8% were between the ages of 18 and 24; 28.7% were from 25 to 44; 23% were from 45 to 64; and 14% were 65 years of age or older. The gender makeup of the city was 48.1% male and 51.9% female. 2000 census As of the census of 2000, there were 14,600 people, 5,917 households, and 4,017 families living in the city. The population density was . There were 6,449 housing units at an average density of . The racial makeup of the city was 98.23% White, 0.05% African American, 0.21% Native American, 0.53% Asian, 0.01% Pacific Islander, 0.33% from other races, and 0.64% from two or more races. Hispanic or Latino of