|Elevation||738 ft (224.9 m)|
|Area||0.21 sq mi (0.54 km2)|
|- land||0.21 sq mi (1 km2)|
|- water||0.00 sq mi (0 km2), 0%|
|Density||1,111.1 / sq mi (429 / km2)|
|- summer (DST)||CDT (UTC-5)|
A post office was established at the site of Kempton in 1869 and called Sugar Loaf. The name of the post office was changed to Kempton in 1878, when the village was founded and named after its founder, Wright Kemp.
Kempton is located at (40.935447, -88.237433).
According to the 2010 census, the village has a total area of 0.21 square miles (0.54 km2), all land.
As of the census of 2000, there were 235 people, 81 households, and 57 families residing in the village. The population density was 1,111.1 people per square mile (432.1/km²). There were 86 housing units at an average density of 406.6 per square mile (158.1/km²). The racial makeup of the village was 98.72% White, 0.43% Asian, and 0.85% from two or more races. Hispanic or Latino of any race were 1.70% of the population.
There were 81 households out of which 35.8% had children under the age of 18 living with them, 58.0% were married couples living together, 8.6% had a female householder with no husband present, and 29.6% were non-families. 24.7% of all households were made up of individuals and 12.3% had someone living alone who was 65 years of age or older. The average household size was 2.90 and the average family size was 3.44.
In the village the population was spread out with 37.4% under the age of 18, 5.5% from 18 to 24, 27.7% from 25 to 44, 17.9% from 45 to 64, and 11.5% who were 65 years of age or older. The median age was 28 years. For every 100 females there were 113.6 males. For every 100 females age 18 and over, there were 98.6 males.
The median income for a household in the village was $41,667, and the median income for a family was $52,750. Males had a median income of $31,563 versus $22,188 for females. The per capita income for the village was $12,641. About 12.7% of families and 18.9% of the population were below the poverty line, including 23.1% of those under the age of eighteen and 8.3% of those sixty five or over.
- Callary, Edward. 2009. Place Names of Illinois. Champaign: University of Illinois Press, p. 184.
- "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.