Jefferson township represents an area within the Jefferson township subdivision of the Madison County (Iowa),
which is not part of any official city, town or other place of the Jefferson township subdivision.
This area is populated by approximatelly 524 people and occupies the area of 37 square miles - 1 square miles represent water areas.
Racial makeup of the population is : White (98.28%), American Indian and Alaska Native (1.15%) and Two or More races (0.57%).
The male part of the population has a median age of 45 and the “median female” is 43 years old.
Statistical data for the Jefferson township based on the 2010 U.S. Census