|Elevation||4,120 ft (1,260 m)|
|Time zone||UTC-8 (Pacific (PST))|
|• Summer (DST)||UTC-7 (PDT)|
Alpha is a former settlement in Nevada County, California. Alpha is located 2 miles (3.2 km) south-southeast of Washington. It is situated at an elevation of 4,120 ft (1,260 m) above sea level. Alpha had a post office during the period of 1855–1862.
The Alpha Hydraulic Diggings were 1 mile (1.6 km) south of the town.
- U.S. Geological Survey Geographic Names Information System: Alpha, 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. 442. ISBN 1-884995-14-4.
- "Alpha (historical)". calsign.com. Archived from the original on 2009-01-06. Retrieved 2009-05-28.
- Tharp, Don. "Nevada County, California Post Offices and Communities Past and Present". Genealogy Trails. genealogytrails.com. Archived from the original on 2013-01-24. Retrieved 2009-06-01.
- "NO. 628 ALPHA HYDRAULIC DIGGINGS". beachcalifornia.com. Retrieved 2009-05-28.