Rainier is a city located in Washington. With a 2020 population of 2,483, it is the 154th largest city in Washington and the 6848th largest city in the United States. Rainier is currently growing at a rate of 4.11% annually and its population has increased by 38.41% since the most recent census, which recorded a population of 1,794 in 2010. Rainier reached it's highest population of 2,483 in 2021. Spanning over 2 miles, Rainier has a population density of 1,433 people per square mile.
The average household income in Rainier is $71,079 with a poverty rate of 16.60%. The median rental costs in recent years comes to $1,338 per month, and the median house value is $206,000. The median age in Rainier is 37.2 years, 34.8 years for males, and 38.9 years for females. For every 100 females there are 106.3 males.