Karlo, California

Karlo is an unincorporated community in Lassen County, California, United States. It is located on the Southern Pacific Railroad in the Secret Valley 20mi east-northeast of Susanville, at an elevation of 4432 feet .The Secret post office opened in 1892, closed in 1895, reopened in 1896, changed its name to Karlo in 1911, and closed for good in 1934. The name Karlo honors Frank De Carlow, who settled nearby in 1886.