How Many People Live In Seattle 2024. The seattle population is 741,251 and has a population density of 8,838 people per square mile, compared to the national average of 91. Seattle is the largest city in the state with a population of 684,451, with a density of 7,962 people per square mile.

Seattle, a city within king county, washington, had a population of 749,256 in 2022. Also for cities and towns with a population of 5,000 or more.