Frontenac is a city located in Kansas. With a 2020 population of 3,400, it is the 81st largest city in Kansas and the 5849th largest city in the United States. Frontenac is currently declining at a rate of -0.15% annually and its population has decreased by -1.08% since the most recent census, which recorded a population of 3,437 in 2010. Frontenac reached it's highest population of 3,462 in 2012. Spanning over 5 miles, Frontenac has a population density of 685 people per square mile.
The average household income in Frontenac is $72,339 with a poverty rate of 5.82%. The median rental costs in recent years comes to $779 per month, and the median house value is $133,000. The median age in Frontenac is 43.3 years, 42.4 years for males, and 43.7 years for females. For every 100 females there are 85.6 males.