Sullivan's Island is a city located in South Carolina. With a 2020 population of 1,924, it is the 119th largest city in South Carolina and the 7750th 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 7.43% since the most recent census, which recorded a population of 1,791 in 2010. Sullivan's Island reached it's highest population of in . Spanning over 3 miles, Sullivan's Island has a population density of 770 people per square mile.
The average household income in Sullivan's Island is $244,808 with a poverty rate of 8.18%. The median rental costs in recent years comes to $2,167 per month, and the median house value is $1.77 Mn. The median age in Sullivan's Island is 47.9 years, 44.6 years for males, and 50.2 years for females.