Castle Rock is a city located in Washington. With a 2020 population of 2,370, it is the 156th largest city in Washington and the 7005th largest city in the United States. Castle Rock is currently growing at a rate of 1.54% annually and its population has increased by 19.58% since the most recent census, which recorded a population of 1,982 in 2010. Castle Rock reached it's highest population of 2,370 in 2021. Spanning over 2 miles, Castle Rock has a population density of 1,138 people per square mile.
The average household income in Castle Rock is $59,182 with a poverty rate of 12.17%. The median rental costs in recent years comes to $795 per month, and the median house value is $165,400. The median age in Castle Rock is 31.5 years, 29.6 years for males, and 31.8 years for females. For every 100 females there are 87.0 males.