Washington township represents an area within the Washington township subdivision of the Butler County (Iowa),
which is not part of any official city, town or other place of the Washington township subdivision.
This area is populated by approximatelly 329 people and occupies the area of 37 square miles - 1 square miles represent water areas.
Racial makeup of the population is : White (96.96%), Some Other Race (1.52%) and Black or African American (0.91%).
The male part of the population has a median age of 46 and the “median female” is 45 years old.
Statistical data for the Washington township based on the 2010 U.S. Census