Clayton is a city located in California. With a 2020 population of 12,403, it is the 350th largest city in California and the 2655th largest city in the United States. Clayton is currently growing at a rate of 0.56% annually and its population has increased by 13.82% since the most recent census, which recorded a population of 10,897 in 2010. Clayton reached it's highest population of 12,403 in 2021. Spanning over 4 miles, Clayton has a population density of 3,230 people per square mile.
The average household income in Clayton is $191,059 with a poverty rate of 1.36%. The median rental costs in recent years comes to $2,627 per month, and the median house value is $771,400. The median age in Clayton is 45.9 years, 45.3 years for males, and 46.5 years for females. For every 100 females there are 91.7 males.