Frontenac is a city located in Missouri. With a 2020 population of 3,582, it is the 172nd largest city in Missouri and the 5715th largest city in the United States. Frontenac is currently growing at a rate of 0.36% annually and its population has increased by 2.87% since the most recent census, which recorded a population of 3,482 in 2010. Frontenac reached it's highest population of 3,920 in 1970. Spanning over 3 miles, Frontenac has a population density of 1,245 people per square mile.
The average household income in Frontenac is $231,693 with a poverty rate of 5.01%. The median rental costs in recent years comes to $1,707 per month, and the median house value is $700,700. The median age in Frontenac is 49.6 years, 50 years for males, and 49.4 years for females. For every 100 females there are 87.7 males.