|Elevation||4,432 ft (1,351 m)|
Karlo (formerly, Secret) is an unincorporated community in Lassen County, California, United States. It is located on the Southern Pacific Railroad in the Secret Valley 20 miles (32 km) east-northeast of Susanville, at an elevation of 4432 feet (1351 m).
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.
- U.S. Geological Survey Geographic Names Information System: Karlo, California
- Durham, David L. (1998). California's Geographic Names: A Gazetteer of Historic and Modern Names of the State. Clovis, Calif.: Word Dancer Press. p. 390. ISBN 1-884995-14-4.
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