As of the 2010 census, its population was 2,966 and it contained 1,271 housing units.

[4] Clay Township was organized in 1835.

[5][6] According to the 2010 census, the township has a total area of 25.3 square miles (66 km2), of which 25.25 square miles (65.4 km2) (or 99.80%) is land and 0.05 square miles (0.13 km2) (or 0.20%) is water.

[4] The township contains four cemeteries: Conaway, Oakdale, Spangler and Windsor.

Clay Township residents may obtain a library card at the Aurora Public Library in Aurora.