A Sierra Central Credit Union branch is located in Susanville, California. Susanville is formerly known as Rooptown and was named after Susan Roop the daughter of Isaac Roop. Susanville is a former logging and mining town and is the county seat of Lassen County, California. The present name of Susanville was adopted in 1857 and is located on the Susan River in the southern part of Lassen County and is considered a gateway city to Reno, Nevada on U.S. Route 395. Susanville, California sits at an elevation of 4,186 feet and is the site of the High Desert State Prison.