Alto was likely named due to its lofty elevation.
- U.S. Geological Survey Geographic Names Information System: Alto, Louisiana
- Leeper, Clare D'Artois (19 October 2012). Louisiana Place Names: Popular, Unusual, and Forgotten Stories of Towns, Cities, Plantations, Bayous, and Even Some Cemeteries. LSU Press. p. 15. ISBN 978-0-8071-4740-5.
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