Grass Valley is a city located in California. With a 2020 population of 12,689, it is the 346th largest city in California and the 2607th largest city in the United States. Grass Valley is currently declining at a rate of -0.50% annually and its population has decreased by -1.33% since the most recent census, which recorded a population of 12,860 in 2010. Grass Valley reached it's highest population of 12,932 in 2017. Spanning over 5 miles, Grass Valley has a population density of 2,418 people per square mile.
The average household income in Grass Valley is $59,278 with a poverty rate of 20.63%. The median rental costs in recent years comes to $1,076 per month, and the median house value is $331,400. The median age in Grass Valley is 46.2 years, 39.5 years for males, and 52.6 years for females. For every 100 females there are 80.2 males.