Placentia’s post office opened in 1893, and 2 of its places are on the National Register
More historic than 36% of U.S. towns · #273 of 847 in California. What drives it
Most of Placentia was built recently: 3% of its homes predate 1940 and the median home dates from 1976. 2 places in town are on the National Register, among them a historic district with 1 buildings. Below: 1 old photo or paper, maps from 1896 on, and the census since 1930.
Founding year: the first Placentia post office (Blevins & Helbock, CC0).The full story ↓
History grade
What drives Placentia’s History grade
On its age, its old homes and the National Register, Placentia is more historic than 36% of U.S. towns, #273 of 847 in California. Its National Register listings hold the grade up; its share of homes from before 1940 pulls it down.
C+
HistoryA character grade: shown, never part of Placentia’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 Placentia’s 0.4 sits above most of its state (68% of California towns have fewer) while its 2 listings outnumber those of 60% of U.S. towns.
How sure. Graded on any two of the three inputs instead, the letter would range from C− to B−. The pre-1940 share (±1.0 points) is firm at this size. The founding year is the first post office, not a stated founding date.
Founding year: the first post office (other dates in Quick answers). 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 Placentia’s past
Read from the archive, the National Register and the record. The page puts what stands out first.
Indigenous peoples of California referred to by the Spanish as Gabrielenos, known as the Tongva, lived in the area for thousands of years. One estimate wrote that the native population in what was to become northern Orange County was at least 1,000. The large village of Hutuknga was closely situated to the area that is now Placentia.
In 1837, the Mexican government granted the area that is now Placentia to Juan Pacifico Ontiveros as part of the Rancho San Juan Cajón de Santa Ana land grant.
In 1865, American pioneer Daniel Kraemer arrived and purchased 3,900 acres (1,600 ha). Many other American pioneers soon followed, and the community developed.
Passages that mention Placentia, cut from the printed page as they were published.
History of Orange County, California1921 · page 225Read the page →
Read the text
Mr. Bradford's place in California history, is pleasantly assured through his distinction as the founder of the town of Placentia. He bought sixty acres of land for the townsite from Richard Melrose of .\naheim in 1910. laid out the town and secured the right-of-way for the 'Santa Fe Railroad to build its line; and Placentia is now a busy, thriving town, with paved streets, modern business lilocks and atlracti'.e hur.ies, situated
Text read by machine from the scan; it may contain errors.
History of Orange County, California1921 · page 596Read the page →
Read the text
After serving as game warden at the Bolsa Gun Club, he leased land on the Irvine Ranch, and has been pursuing agriculture there or elsewhere ever since. In 1899 he removed to Placentia and purchased five acres on the flats east of Richfield; and this land he improved and developed, making of it a very profitable grove of oranges. Meanwhile, he contracted for the making and grading of roads and the care of the water reservoirs for Yorba Linda, and altogether he spent fifteen years in the service of the Santa Fe Railroad, grading and making crossings, and also graded the streets for the town of Placentia when it was laid out. Of late years he has had full charge
Text read by machine from the scan; it may contain errors.
Scans and text from the Internet Archive. Books published in 1930 or earlier, which are in the public domain.
Timeline
Placentia, 1893 to 1928
Woven from the archive, old maps, post office records, the National Register and the people born here.
Nothing in the archives for these yearsWeddings on Main Street, storms, parades, school pictures, the old store. If it’s in your family album, it belongs here.
Fire insurance maps drew every building, what it was made of and what it was used for, so insurers could price the risk of fire. Pick a year, then a sheet.
The Placentia post office opened in 1893, the earliest record of the town by name (U.S. post office records).
How does Placentia rank for history?
Placentia is more historic than 36% of U.S. towns, #273 of 847 in California. 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.
What is on the National Register in Placentia?
Two places: the George Key Ranch (listed 1975) and the A. S. Bradford House (1978).
How old are the homes in Placentia?
3% of Placentia’s homes were built before 1940 (Census estimate, ±1.0 points), against a typical 3.4% for a California town; the median home was built in 1976.
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 Wikimedia Commons (5), Wikidata (1), the National Register of Historic Places (2), Wikipedia, U.S. Geological Survey historical maps, U.S. Census counts (via Wikipedia), the US Post Offices dataset (Blevins & Helbock), the USGS Geographic Names Information System, Sanborn fire insurance maps (Library of Congress) and old county and town histories (Internet Archive). Archive images are copied here with their credits and licenses, shown on each photo’s page. Refreshed monthly.
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