Mansfield is a village in Piatt County, Illinois in the United States. The population was 949 at the 2000 census.
Mansfield is located at 40°12′46″N 88°30′27″W / 40.21278°N 88.50750°W / 40.21278; -88.50750 (40.212795, -88.507416).
According to the 2010 census, Mansfield has a total area of 0.555 square miles (1.44 km), of which 0.53 square miles (1.37 km) (or 95.5%) is land and 0.025 square miles (0.06 km) (or 4.5%) is water.
As of the census of 2000, there were 949 people, 396 households, and 293 families residing in the village. The population density was 1,856.3 people per square mile (718.5/km²). There were 424 housing units at an average density of 829.4 per square mile (321.0/km²). The racial makeup of the village was 98.95% White, 0.53% Asian, and 0.53% from two or more races. Hispanic or Latino of any race were 0.63% of the population.
There were 396 households out of which 31.3% had children under the age of 18 living with them, 63.4% were married couples living together, 7.3% had a female householder with no husband present, and 25.8% were non-families. 22.5% of all households were made up of individuals and 9.1% had someone living alone who was 65 years of age or older. The average household size was 2.40 and the average family size was 2.79.
In the village, the population was spread out with 22.9% under the age of 18, 7.5% from 18 to 24, 29.4% from 25 to 44, 27.4% from 45 to 64, and 12.9% who were 65 years of age or older. The median age was 39 years. For every 100 females, there were 94.1 males. For every 100 females age 18 and over, there were 92.1 males.
The median income for a household in the village was $43,942, and the median income for a family was $48,393. Males had a median income of $32,042 versus $23,047 for females. The per capita income for the village was $20,947. About 1.4% of families and 3.9% of the population were below the poverty line, including 4.6% of those under age 18 and 1.6% of those age 65 or over.