Laenna Township is located in Logan County, Illinois.

As of the 2010 census, its population was 584 and it contained 282 housing units.

[2] According to the 2010 census, the township has a total area of 35.07 square miles (90.8 km2), of which 35.05 square miles (90.8 km2) (or 99.94%) is land and 0.02 square miles (0.052 km2) (or 0.06%) is water.

[2] The township includes the geographical center of the State of Illinois, a small monument to which has been erected at 40°3.157'N 89°11.087'W (40.05259,-89.18482), in a park southeast of Melvin Street and East Olive Street in the village of Chestnut.

This Logan County, Illinois location article is a stub.