Sumner township represents an area within the Sumner township subdivision of the Winneshiek County (Iowa),
which is not part of any official city, town or other place of the Sumner township subdivision.
This area is populated by approximatelly 311 people and occupies the area of 36 square miles - 0 square miles represent water areas.
Racial makeup of the population is : White (100%), Two or More races (0%) and (%).
The male part of the population has a median age of 45 and the “median female” is 46 years old.
Statistical data for the Sumner township based on the 2010 U.S. Census