Monroe is a city located in Washington. With a 2020 population of 20,205, it is the 58th largest city in Washington and the 1828th largest city in the United States. Monroe is currently growing at a rate of 2.13% annually and its population has increased by 16.76% since the most recent census, which recorded a population of 17,304 in 2010. Spanning over 6 miles, Monroe has a population density of 3,315 people per square mile.
The average household income in Monroe is $91,704 with a poverty rate of 7.68%. The median rental costs in recent years comes to $1,309 per month, and the median house value is $317,100. The median age in Monroe is 33.7 years, 34.3 years for males, and 32.9 years for females. For every 100 females there are 122.3 males.