Vandalia is a city located in Missouri. With a 2020 population of 3,888, it is the 166th largest city in Missouri and the 5480th largest city in the United States. Vandalia is currently declining at a rate of -2.04% annually and its population has decreased by -0.28% since the most recent census, which recorded a population of 3,899 in 2010. Vandalia reached it's highest population of 4,320 in 2015. Spanning over 2 miles, Vandalia has a population density of 1,733 people per square mile.
The average household income in Vandalia is $42,178 with a poverty rate of 17.61%. The median rental costs in recent years comes to $599 per month, and the median house value is $64,900. The median age in Vandalia is 36.5 years, 36.1 years for males, and 36.6 years for females. For every 100 females there are 40.8 males.