1 of Rosemont’s places is on the National Register
More historic than 34% of U.S. towns · #295 of 847 in California. What drives it
Its Register listing is the Brighton School. Most of Rosemont was built recently: 1% of its homes predate 1940 and the median home dates from 1977. Below: maps from 1902 on and the census since 1980.
On its age, its old homes and the National Register, Rosemont is more historic than 34% of U.S. towns, #295 of 847 in California. 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 Rosemont’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 Rosemont’s 0.8 sits above most of its state (75% of California towns have fewer) while its 2 historic buildings outnumber those of 60% 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 (±0.5 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 Rosemont’s past
Read from the archive, the National Register and the record. The page puts what stands out first.
Every edition of the U.S. Geological Survey’s map of Rosemont. Tap a year, or press play to watch the town change.
1902Fairoaks sheet · 1:62,500
U.S. Geological Survey historical topographic maps (public domain), via Esri’s collection of the scans. The red ring marks the center of Rosemont.
The story so far
Rosemont, in brief
Wikipedia doesn’t have a history of Rosemont yet. The photos, dates and memories neighbors add here are how it gets written.
Rosemont is a census-designated place (CDP) in Sacramento County, California, United States. It is part of the Sacramento–Arden-Arcade–Roseville metropolitan area. The population rose to 23,510 at the 2020 census. It was 22,681 at the 2010 census, down from 22,904 at the 2000 census.
Between the 2010 and 2020 censuses its population grew from 22,681 to 23,510 (+4%).
Intro from Wikipedia. Population: U.S. Census Bureau.
Timeline
Rosemont, 1869 to 1957
Woven from the archive, old maps, post office records, the National Register and the people born here.
Rosemont is more historic than 34% of U.S. towns, #295 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 Rosemont?
One place: the Brighton School (listed 1981).
How old are the homes in Rosemont?
1% of Rosemont’s homes were built before 1940 (Census estimate), against a typical 3.4% for a California town; the median home was built in 1977.
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 the National Register of Historic Places (1), U.S. Geological Survey historical maps, U.S. Census counts (via Wikipedia), the US Post Offices dataset (Blevins & Helbock) 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.
