Diamond Bar is a city located in California. With a 2020 population of 54,948, it is the 165th largest city in California and the 710th largest city in the United States. Diamond Bar is currently declining at a rate of -0.70% annually and its population has decreased by -1.07% since the most recent census, which recorded a population of 55,544 in 2010. Diamond Bar reached it's highest population of 56,581 in 2016. Spanning over 15 miles, Diamond Bar has a population density of 3,695 people per square mile.
The average household income in Diamond Bar is $119,892 with a poverty rate of 6.14%. The median rental costs in recent years comes to $2,071 per month, and the median house value is $664,400. The median age in Diamond Bar is 42.6 years, 40.3 years for males, and 44.3 years for females. For every 100 females there are 92.3 males.