Frontenac is a city located in Missouri. With a 2020 population of 3,554, it is the 173rd largest city in Missouri and the 5733rd largest city in the United States. Frontenac is currently growing at a rate of 0.31% annually and its population has increased by 2.07% 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 1,235 people per square mile.
The average household income in Frontenac is $284,319 with a poverty rate of 2.99%. The median rental costs in recent years comes to - per month, and the median house value is $694,300. The median age in Frontenac is 50.2 years, 49.6 years for males, and 50.5 years for females. For every 100 females there are 98.5 males.