The Jefferson township is a subdivision of the Johnson County, in the state of Iowa.
This subdivision represents an area of 27 square miles - 2 square miles are water areas.
There are 2 cities, towns or villages in the Jefferson township subdivision - their combined population count is 1.456.
Approximatelly 2.666 people live in “Remainders” areas, that are officially not part of any city or town.
Total population of the subdivision is 4.122.
Racial makeup of this subdivision is as follows : White (97.7%),
followed by Asian (1.12%) and Two or More races (0.41%).
Median age for the male population is 43 and 44 for the female part.
Statistical data for the Jefferson township based on the 2010 U.S. Census