Cooper Township, Sangamon County, Illinois

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Cooper Township is a small, rural area in Sangamon County, Illinois. It covers about 28.5 square miles, with almost all of it land and a tiny amount of water. In 2020, about 758 people lived there, in roughly 300 households, making it a sparsely populated community.

The township is relatively affluent for a rural part of Illinois. The median age is about 47 years, and the average household has about 2.5 people. About two‑thirds of adults are in the workforce, with unemployment below state and national levels.

Economically, residents have high incomes: per‑capita income around $47,500 and median household income around $128,000. The typical home is worth about $253,500, and nearly all homes are owner‑occupied. Educational attainment is strong, with all adults having at least a high school diploma and about 38% holding a bachelor’s degree or higher, a level higher than many rural areas and in line with nearby suburbs.