|Elevation||672 ft (205 m)|
|Area||1.85 sq mi (5 km2)|
|- land||1.85 sq mi (5 km2)|
|- water||0.00 sq mi (0 km2)|
|Density||738.9 / sq mi (285 / km2)|
|- summer (DST)||CDT (UTC-5)|
|Wikimedia Commons: Harristown, Illinois|
Harristown is located at (39.842673, -89.069495).
According to the 2010 census, the village has a total area of 1.85 square miles (4.8 km2), all land.
Harristown, Illinois, is located in Macon County and lies just west of Decatur. Abraham Lincoln's first home in Illinois was located on the north bank of the Sangamon River, about three miles south of Harristown.
As of the census of 2000, there were 1,338 people, 511 households, and 402 families residing in the village. The population density was 720.9 people per square mile (277.7/km²). There were 525 housing units at an average density of 282.9 per square mile (109.0/km²). The racial makeup of the village was 98.88% White, 0.30% African American, 0.07% Native American, 0.07% Asian, and 0.67% from two or more races. Hispanic or Latino of any race were 0.30% of the population.
There were 511 households out of which 32.3% had children under the age of 18 living with them, 68.5% were married couples living together, 6.5% had a female householder with no husband present, and 21.3% were non-families. 19.0% of all households were made up of individuals and 8.0% had someone living alone who was 65 years of age or older. The average household size was 2.62 and the average family size was 2.98.
In the village the population was spread out with 25.1% under the age of 18, 6.5% from 18 to 24, 29.8% from 25 to 44, 25.3% from 45 to 64, and 13.3% who were 65 years of age or older. The median age was 39 years. For every 100 females there were 100.9 males. For every 100 females age 18 and over, there were 96.5 males.
The median income for a household in the village was $42,946, and the median income for a family was $48,162. Males had a median income of $37,273 versus $23,750 for females. The per capita income for the village was $18,689. About 4.1% of families and 5.0% of the population were below the poverty line, including 9.2% of those under age 18 and 3.5% of those age 65 or over.
- "US Gazetteer files: 2010, 2000, and 1990". United States Census Bureau. 2011-02-12. Retrieved 2011-04-23.
- "2010 Census U.S. Gazetteer Files for Places – Illinois". United States Census. Retrieved 2012-10-13.
- "American FactFinder". United States Census Bureau. Retrieved 2008-01-31.