San Anselmo is a city located in California. With a 2020 population of 12,384, it is the 351st largest city in California and the 2657th largest city in the United States. San Anselmo is currently declining at a rate of -0.37% annually but its population has increased by 0.39% since the most recent census, which recorded a population of 12,336 in 2010. San Anselmo reached it's highest population of 13,031 in 1970. Spanning over 3 miles, San Anselmo has a population density of 4,626 people per square mile.
The average household income in San Anselmo is $174,965 with a poverty rate of 2.89%. The median rental costs in recent years comes to $1,930 per month, and the median house value is $1.07 Mn. The median age in San Anselmo is 47.7 years, 48 years for males, and 47.3 years for females. For every 100 females there are 90.2 males.