Hillsboro is a town in Cain Township, Fountain County, Indiana, United States. The population was 538 at the 2010 census. History The post office was established in 1829 as Hillsborough. It was named from the terrain. Geography Hillsboro is located at (40.108638, -87.159062). It is at the intersection of U.S. Route 136 and State Road 341, about a mile south of Interstate 74. According to the 2010 census, Hillsboro has a total area of , all land. Demographics 2010 census As of the census of 2010, there were 538 people, 207 households, and 150 families living in the town. The population density was . There were 232 housing units at an average density of . The racial makeup of the town was 96.1% White, 0.2% African American, 0.7% Native American, 1.9% from other races, and 1.1% from two or more races. Hispanic or Latino of any race were 5.4% of the population. There were 207 households, of which 37.7% had children under the age of 18 living with them, 51.7% were married couples living together, 17.4% had a female householder with no husband present, 3.4% had a male householder with no wife present, and 27.5% were non-families. 21.3% of all households were made up of individuals, and 8.7% had someone living alone who was 65 years of age or older. The average household size was 2.60 and the average family size was 3.01. The median age in the town was 38.2 years. 27.5% of residents were under the age of 18; 8.1% were between the ages of 18 and 24; 25.1% were from 25 to 44; 26.2% were from 45 to 64; and 13% were 65 years of age or older. The gender makeup of the town was 48.7% male and 51.3% female. 2000 census As of the census of 2000, there were 489 people, 188 households, and 140 families living in the town. The population density was . There were 211 housing units at an average density of . The racial makeup of the town was 99.39% White, 0.20% from other races, and 0.41% from two or more races. Hispanic or Latino of any race were 0.41% of the population. There were 188 households, out of which 37.8% had children under the age of 18 living with them, 60.6% were married couples living together, 10.1% had a female householder with no husband present, and 25.5% were non-families. 22.9% of