Chatham is a village in Sangamon County, Illinois, United States.

Chatham is part of the Springfield, Illinois Metropolitan Statistical Area.

As of the census[7] of 2000, there were 8,583 people, 3,083 households, and 2,472 families residing in the village.

There were 3,165 housing units at an average density of 637.4 per square mile (246.1/km2).

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.

Chatham was one of five area schools awarded the Bright Star Award for educational excellence at the elementary and high school level.