The restored Adelaida School in 2013
|County||San Luis Obispo|
|Elevation||1,404 ft (428 m)|
|Time zone||Pacific (PST) (UTC-8)|
|• Summer (DST)||PDT (UTC-7)|
|GNIS feature ID||1660231|
Adelaida is locally pronounced without the terminal "a." 19th century documents commonly spell the place name as "Adelaide". 
In the 1880s, the population of Adelaida was approximately 500, supported by the prospering Klau and Buena Vista mercury mines. The town boasted a community center, saloon, dance hall, general store, and four schools. The population increased further in 1898 with an influx of Mennonite settlers. The Adelaida School, located near the entrance to the Osgood Ranch on Chimney Rock Road, was built in 1917. It is being restored by the Adelaida Historical Foundation.  This school and the Klau Mine Road cemetery are all that is left of old Adelaida. Although the quicksilver mines were in operation into the 1970s, most of the local businesses had long since relocated to Paso Robles.
- "US Board on Geographic Names". United States Geological Survey. 2007-10-25. Retrieved 2008-01-31.
- Durham, David L. (1998). California's Geographic Names: A Gazetteer of Historic and Modern Names of the State. Quill Driver Books. p. 861. ISBN 1-884995-14-4.
- David W. Kean, 1993, Wide Places in California Roads. Sunnyvale, Concord Press. ISBN 1884261000
- Schoolhouse restoration project
- David W. Kean, Wide Places in the California Roads: The encyclopedia of California's small towns and the roads that lead to them (Volume 1 of 4: Southern California Counties), pp. 11-12
- A day trip to the town of Adelaida, SLO Tribune, January 10, 2011
- Adelaida one room schoolhouse closes, 1964, SLO Tribune, reprint of June 14, 1964 edition of the Telegram-Tribune
- Adelaida (SLO County) profile
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