Mattawa is a city located in Washington. With a 2020 population of 4,818, it is the 126th largest city in Washington and the 4866th largest city in the United States. Mattawa is currently growing at a rate of 0.63% annually and its population has increased by 8.59% since the most recent census, which recorded a population of 4,437 in 2010. Mattawa reached it's highest population of 4,818 in 2021. Spanning over 1 miles, Mattawa has a population density of 5,224 people per square mile.
The average household income in Mattawa is $54,712 with a poverty rate of 13.57%. The median rental costs in recent years comes to $847 per month, and the median house value is $108,100. The median age in Mattawa is 23.4 years, 23.1 years for males, and 23.5 years for females. For every 100 females there are 127.6 males.