Bay St. Louis is a city located in Mississippi. With a 2020 population of 15,066, it is the 26th largest city in Mississippi and the 2308th largest city in the United States . Bay St. Louis is currently growing at a rate of 3.55% annually and its population has increased by 62.70% since the most recent census, which recorded a population of 9,260 in 2010. Bay St. Louis reached it's highest population of 15,066 in 2021. Spanning over 27 miles, Bay St. Louis has a population density of 1,025 people per square mile.
The average household income in Bay St. Louis is $56,509 with a poverty rate of 22.04%. The median rental costs in recent years comes to $835 per month, and the median house value is $172,600. The median age in Bay St. Louis is 45.1 years, 41.7 years for males, and 46.8 years for females.