Cedarville (formerly, Surprise Valley and Deep Creek) is a census-designated place in Modoc County, California. It is located 20 miles (32 km) east of Alturas, at an elevation of 4652 feet (1418 m).
By 1880 Cedarville was the largest town in the valley, with a population of around 220. The town has grown little in the following hundred years; however, as of the 2010 census, the population was 514.
The ZIP code for Cedarville is 96104. Wired telephone numbers in Cedarville follow the format (530) 279-2xxx or 279-6xxx. Wired telephone service is provided by Frontier Communications. Cedarville Hospital, operated by the Surprise Valley Hospital District, is located on Main Street at Washington. Cedarville Airport is located along Surprise Valley Road 1.5 miles (2.4 km) north of State Route 299.