Mercer Island is a city located in Washington. With a 2020 population of 26,246, it is the 42nd largest city in Washington and the 1460th largest city in the United States. Mercer Island is currently growing at a rate of 0.52% annually and its population has increased by 15.63% since the most recent census, which recorded a population of 22,699 in 2010. Spanning over 13 miles, Mercer Island has a population density of 4,112 people per square mile.
The average household income in Mercer Island is $219,325 with a poverty rate of 4.70%. The median rental costs in recent years comes to $1,977 per month, and the median house value is $1.14 Mn. The median age in Mercer Island is 46 years, 45.3 years for males, and 46.3 years for females. For every 100 females there are 94.3 males.