Sullivan's Island is a city located in South Carolina. With a 2020 population of 1,921, it is the 120th largest city in South Carolina and the 7749th largest city in the United States. Sullivan's Island is currently declining at a rate of 0.00% annually and its population has increased by 7.26% since the most recent census, which recorded a population of 1,791 in 2010. Sullivan's Island reached it's highest population of 1,925 in 2016. Spanning over 3 miles, Sullivan's Island has a population density of 769 people per square mile.
The average household income in Sullivan's Island is $216,733 with a poverty rate of 7.69%. The median rental costs in recent years comes to $2,293 per month, and the median house value is $1.58 Mn. The median age in Sullivan's Island is 48.1 years, 45.8 years for males, and 49.6 years for females. For every 100 females there are 101.7 males.