Harmon township represents an area within the Harmon township subdivision of the Roberts County (South Dakota),
which is not part of any official city, town or other place of the Harmon township subdivision.
This area is populated by approximatelly 151 people and occupies the area of 67 square miles - 5 square miles represent water areas.
Racial makeup of the population is : White (94.04%), Two or More races (2.65%) and Black or African American (0.66%).
The male part of the population has a median age of 48 and the “median female” is 44 years old.
Statistical data for the Harmon township based on the 2010 U.S. Census