Susanville is a city located in Lassen County California. It is also the county seat of Lassen County. With a 2020 population of 14,826, it is the 331st largest city in California and the 2334th largest city in the United States . Susanville is currently declining at a rate of -0.62% annually and its population has decreased by -17.39% since the most recent census, which recorded a population of 17,947 in 2010. Susanville reached it's highest population of 17,725 in 2010. Spanning over 8 miles, Susanville has a population density of 1,866 people per square mile.
The average household income in Susanville is $66,505 with a poverty rate of 18.90%. The median rental costs in recent years comes to $971 per month, and the median house value is $183,700. The median age in Susanville is 31.7 years, 30.6 years for males, and 38 years for females.