On its age, its old homes and the National Register, Leona Valley is more historic than 10% of U.S. towns. Its National Register listings hold the grade up; its share of homes from before 1940 pulls it down.
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HistoryA character grade: shown, never part of Leona Valley’s overall grade.
Few California towns list much on the Register (a typical California town has 0.0 per 10,000 residents, the U.S. 2.4), so Leona Valley’s 0.0 sits below most of its state (31% of California towns have fewer) while its 0 listings outnumber those of 23% of U.S. towns.
How sure. Graded on two of the three inputs, so a change in either one moves the letter more than it would with three. The pre-1940 share (±1.7 points) is firm at this size.
Founding year: our sources. Homes: Census ACS 2020–24. National Register: National Park Service, May 2026 list; each listing counted once (boundary changes and added documentation belong to their listing), and a historic district counts its contributing buildings. How TownRatings grades history →
What stands out about Leona Valley’s past
Read from the archive, the National Register and the record. The page puts what stands out first.
Leona Valley's post colonial history can be best described as land abundant with cattle ranches. In the late 18th century, after the loss of the Tataviam Native Americans – the area's original inhabitants – to Indian Reductions as Mission Indians at the Mission San Fernando immigrants from Spain and Mexico quickly established themselves. The majority of the immigrants were primarily interested in the land in order to establish cattle ranches. During the 1830s, the ranches were broken up into smaller homesteads by farmers from Germany, France and the state of Nebraska. The Ritter family started one of the first wineries in this country in Leona Valley which was later shut down by the U.S. Prohibition period in the early 20th century.
Leona Valley is more historic than 10% of U.S. towns. The History grade combines the town’s founding era, the share of homes built before 1940 and its National Register listings. It’s a character grade, so it isn’t part of the overall grade. How it works.
How old are the homes in Leona Valley?
1% of Leona Valley’s homes were built before 1940 (Census estimate, ±1.7 points), against a typical 3.4% for a California town; the median home was built in 1974.
Founding dates: Wikidata, Wikipedia, the U.S. post office records of Blevins & Helbock (CC0) and the Census. Homes by year built: Census ACS 2020–24. National Register of Historic Places: National Park Service (list of May 22, 2026). Old photos, postcards and papers: Wikimedia Commons, the Library of Congress and other public archives, credited on each item’s page. Maps: U.S. Geological Survey historical topographic maps (via Esri) and Sanborn fire-insurance maps (Library of Congress). History text and census tables: Wikipedia (CC BY-SA 4.0). Places that used to be: USGS Geographic Names Information System (2021).
From Wikipedia and the USGS Geographic Names Information System. Archive images are copied here with their credits and licenses, shown on each photo’s page. Refreshed monthly.
