Alto township represents an area within the Alto township subdivision of the Roberts County (South Dakota),
which is not part of any official city, town or other place of the Alto township subdivision.
This area is populated by approximatelly 66 people and occupies the area of 37 square miles - 2 square miles represent water areas.
Racial makeup of the population is : White (68.18%), American Indian and Alaska Native (31.82%) and Two or More races (0%).
The male part of the population has a median age of 40 and the “median female” is 41 years old.
Statistical data for the Alto township based on the 2010 U.S. Census