Marco Island is a city located in Florida. With a 2020 population of 17,995, it is the 125th largest city in Florida and the 2019th largest city in the United States. Marco Island is currently growing at a rate of 0.13% annually and its population has increased by 9.64% since the most recent census, which recorded a population of 16,413 in 2010. Marco Island reached it's highest population of 17,995 in 2021. Spanning over 25 miles, Marco Island has a population density of 1,480 people per square mile.
The average household income in Marco Island is $142,117 with a poverty rate of 6.03%. The median rental costs in recent years comes to $1,638 per month, and the median house value is $678,900. The median age in Marco Island is 65.3 years, 66.3 years for males, and 64.5 years for females. For every 100 females there are 99.8 males.