Thorntown is located at . According to the 2010 census, Thorntown has a total area of, all land.
Demographics
2010 census
As of the census of 2010, there were 1,520 people, 556 households, and 422 families living in the town. The population density was. There were 622 housing units at an average density of. The racial makeup of the town was 99.1% White, 0.1% African American, 0.2% Native American, 0.1% from other races, and 0.5% from two or more races. Hispanic or Latino of any race were 0.7% of the population. There were 556 households of which 37.1% had children under the age of 18 living with them, 51.4% were married couplesliving together, 16.9% had a female householder with no husband present, 7.6% had a male householder with no wife present, and 24.1% were non-families. 20.7% of all households were made up of individuals and 11.7% had someone living alone who was 65 years of age or older. The average household size was 2.73 and the average family size was 3.10. The median age in the town was 37.5 years. 26% of residents were under the age of 18; 10.7% were between the ages of 18 and 24; 22.6% were from 25 to 44; 27.8% were from 45 to 64; and 13% were 65 years of age or older. The gender makeup of the town was 47.8% male and 52.2% female.
2000 census
As of the census of 2000, there were 1,562 people, 589 households, and 444 families living in the town. The population density was 2,736.1 people per square mile. There were 632 housing units at an average density of 1,107.1 per square mile. The racial makeup of the town was 97.57% White, 0.13% Asian, 1.47% from other races, and 0.83% from two or more races. Hispanic or Latino of any race were 1.98% of the population. There were 589 households out of which 37.4% had children under the age of 18 living with them, 59.9% were married couples living together, 11.0% had a female householder with no husband present, and 24.6% were non-families. 22.2% of all households were made up of individuals and 10.4% had someone living alone who was 65 years of age or older. The average household size was 2.65 and the average family size was 3.07. In the town, the population was spread out with 29.3% under the age of 18, 7.2% from 18 to 24, 29.4% from 25 to 44, 21.0% from 45 to 64, and 13.0% who were 65 years of age or older. The median age was 36 years. For every 100 females, there were 95.0 males. For every 100 females age 18 and over, there were 87.8 males. The median income for a household in the town was $38,289, and the median income for a family was $43,194. Males had a median income of $33,750 versus $24,524 for females. The per capita income for the town was $19,109. About 5.4% of families and 6.6% of the population were below the poverty line, including 6.4% of those under age 18 and 10.7% of those age 65 or over.
Government
The town is governed by a who oversees all sewage, electric, and police and fire service. The town board is also in charge of capital improvements and special projects such as road construction, signage, ordinance adoption, and administrating over the town court. There are five members of the board and a president is chosen from among them. The town's fire service is provided by and ambulance service is provided by . The town's police department consists of four full-time police officers and anywhere between six and nine reserve officers. The town's police department falls under the . The town uses three police vehicles and provides almost 24-hour service. The town's marshals are also in charge of collecting loose or stray animals as well as enforcing local ordinance and state laws. The officers have full police authority within anywhere in the state of Indiana as prescribed by law.
Paul Hutchens, writer of a 36 book series about 6 boys' adventures in Thorntown, titled the Sugar Creek Gang. His stories have sold over two million copies.
