Sumner Township is located in Warren County, Illinois, United States.

The village of Little York is located in this township.

According to the 2010 census, the township has a total area of 37.07 square miles (96.0 km2), all land.

[2] As of the 2010 census, its population was 572 and it contained 262 housing units.

This Warren County, Illinois location article is a stub.