Linn County formed around 1966 in Linn County, Iowa, USA as the Prophets". In 1968, the band signed with Mercury Records, moved to San Francisco, California, and changed its name to Linn County. They released their first album Proud Flesh Soothseer in 1968 and toured, performing with bands and people such as: Albert King, Led Zeppelin, Sly & the Family Stone, Eric Burdon & the Animals and Ten Years After. They were becoming more well known when the group broke up shortly after Clark Pierson left to join Janis Joplin and Steve Miller left to join Elvin Bishop. Fred Walk kept the band together with different personnel for a time then disbanded the group in 1973. Linn County also headlined or played with Ike & Tina Turner, Earl Hooker, John Lee Hooker,Paul Butterfield, Bo Diddley, Howlin' Wolf, Elvin Bishop, Charlie Musselwhite, Steve Miller, Albert Collins and a host of others during rock festivals. When Linn County signed with Mercury, they were given the (then) unheard of sum of $50,000.00 as a signing bonus plus funds to move the group from Chicago to San Francisco.
Linn County released three albums from 1968 to 1970. Over the course of their existence, they had seven band members.