Jefferson is a city located in South Dakota. With a 2020 population of 500, it is the 117th largest city in South Dakota and the 13303rd largest city in the United States. Jefferson is currently declining at a rate of -1.19% annually and its population has decreased by -8.59% since the most recent census, which recorded a population of 547 in 2010. Jefferson reached it's highest population of 551 in 2010. Spanning over 1 miles, Jefferson has a population density of 979 people per square mile.
The average household income in Jefferson is $61,215 with a poverty rate of 11.20%. The median rental costs in recent years comes to $408 per month, and the median house value is $109,300. The median age in Jefferson is 37.9 years, 37.3 years for males, and 39.7 years for females. For every 100 females there are 99.4 males.