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Chatham is a village located in Sangamon County, Illinois. As of the 2000 census, the village had a total population of 8,583.
Chatham is located at 39°40'22" North, 89°41'54" West (39.672899, -89.698385).
According to the United States Census Bureau, the village has a total area of 12.9 km2 (5.0 mi2). 12.9 km2 (5.0 mi2) of it is land and none of it is covered by water.
As of the census of 2000, there were 8,583 people, 3,083 households, and 2,472 families residing in the village. The population density was 666.8/km2 (1,728.7/mi2). There were 3,165 housing units at an average density of 245.9/km2 (637.4/mi2). The racial makeup of the village was 97.48% White, 0.77% African American, 0.15% Native American, 0.90% Asian, 0.00% Pacific Islander, 0.15% from other races, and 0.55% from two or more races. 0.77% of the population were Hispanic or Latino of any race.
There were 3,083 households out of which 47.4% had children under the age of 18 living with them, 65.9% were married couples living together, 11.1% had a female householder with no husband present, and 19.8% were non-families. 16.5% of all households were made up of individuals and 4.7% had someone living alone who was 65 years of age or older. The average household size was 2.78 and the average family size was 3.13.
In the village the population was spread out with 32.0% under the age of 18, 6.5% from 18 to 24, 31.7% from 25 to 44, 22.6% from 45 to 64, and 7.2% who were 65 years of age or older. The median age was 35 years. For every 100 females there were 96.4 males. For every 100 females age 18 and over, there were 90.6 males.
The median income for a household in the village was $60,350, and the median income for a family was $64,257. Males had a median income of $45,543 versus $31,883 for females. The per capita income for the village was $23,167. 4.7% of the population and 2.8% of families were below the poverty line. 5.2% of those under the age of 18 and 5.6% of those 65 and older were living below the poverty line.
Points of interest
- Interurban Trail (Chatham and Woodside townships, 4.75 mi. in length)
- Chatham Railroad Museum (1902) 
- Glenwood High School