Knox is a city located in Indiana. With a 2020 population of 3,485, it is the 147th largest city in Indiana and the 5780th largest city in the United States. Knox is currently declining at a rate of -0.71% annually and its population has decreased by -5.91% since the most recent census, which recorded a population of 3,704 in 2010. Knox reached it's highest population of 3,721 in 2000. Spanning over 4 miles, Knox has a population density of 889 people per square mile.
The average household income in Knox is $46,533 with a poverty rate of 18.60%. The median rental costs in recent years comes to $639 per month, and the median house value is $80,800. The median age in Knox is 39.5 years, 34.4 years for males, and 42.8 years for females. For every 100 females there are 111.1 males.