Rainier is a city located in Washington. With a 2020 population of 2,425, it is the 157th largest city in Washington and the 6927th largest city in the United States. Rainier is currently growing at a rate of 4.80% annually and its population has increased by 35.17% since the most recent census, which recorded a population of 1,794 in 2010. Spanning over 2 miles, Rainier has a population density of 1,399 people per square mile.
The average household income in Rainier is $72,150 with a poverty rate of 16.29%. The median rental costs in recent years comes to $1,336 per month, and the median house value is $186,400. The median age in Rainier is 35.1 years, 32.3 years for males, and 36.2 years for females. For every 100 females there are 108.5 males.