Slidell is a city located in St. Tammany Parish Louisiana. With a 2020 population of 27,359, it is the 13th largest city in Louisiana and the 1405th largest city in the United States . Slidell is currently declining at a rate of -0.50% annually but its population has increased by 1.08% since the most recent census, which recorded a population of 27,068 in 2010. Slidell reached it's highest population of in . Spanning over 16 miles, Slidell has a population density of 1,785 people per square mile.
The average household income in Slidell is $71,446 with a poverty rate of 15.15%. The median rental costs in recent years comes to $1,042 per month, and the median house value is $161,700. The median age in Slidell is 36.7 years, 36 years for males, and 37.5 years for females.