Mill Valley is a city located in California. With a 2020 population of 14,151, it is the 337th largest city in California and the 2402nd largest city in the United States. Mill Valley is currently declining at a rate of -0.51% annually but its population has increased by 1.78% since the most recent census, which recorded a population of 13,903 in 2010. Mill Valley reached it's highest population of 14,383 in 2014. Spanning over 5 miles, Mill Valley has a population density of 2,971 people per square mile.
The average household income in Mill Valley is $257,825 with a poverty rate of 4.75%. The median rental costs in recent years comes to $2,392 per month, and the median house value is $1.51 Mn. The median age in Mill Valley is 48.1 years, 47.2 years for males, and 48.7 years for females. For every 100 females there are 83.3 males.