Auburn is a city in and the county seat of Placer County, California, United States. Its population was 13,330 during the 2010 census. Auburn is known for its California Gold Rush history, and is registered as a California Historical Landmark.
Auburn is part of the Sacramento metropolitan area and is home to the Auburn State Recreation Area, the site of a number of sporting endurance events. Events include the Western States Endurance Run; the Western States Trail Ride, also known as Tevis Cup Equestrian Ride; American River 50 Mile Endurance Run; American River 50 Mile Equestrian Ride; Way Too Cool 50 Kilometer Endurance Run; Auburn International Half Iron Triathlon; Auburn Century 100 Mile Bike Ride; Coolest 24 Hour Mountain Bike Race; Rio Del Lago 100 Mile Endurance Run; Sierra Nevada 50 Mile Endurance Run; and the Coolest Run: Ride & Tie.