Black Diamond is a city located in Washington. With a 2020 population of 4,519, it is the 126th largest city in Washington and the 5044th largest city in the United States. Black Diamond is currently growing at a rate of 0.47% annually and its population has increased by 8.87% since the most recent census, which recorded a population of 4,151 in 2010. Spanning over 7 miles, Black Diamond has a population density of 690 people per square mile.
The average household income in Black Diamond is $108,802 with a poverty rate of 7.87%. The median rental costs in recent years comes to $822 per month, and the median house value is $399,800. The median age in Black Diamond is 41.1 years, 41.4 years for males, and 40.6 years for females. For every 100 females there are 95.7 males.