Half of South San Gabriel’s homes were built after 1962
More historic than 24% of U.S. towns · #397 of 847 in California. What drives it
Most of South San Gabriel was built recently: 7% of its homes predate 1940 and the median home dates from 1962. Below: maps from 1896 on and the census since 1970.
On its age, its old homes and the National Register, South San Gabriel is more historic than 24% of U.S. towns, #397 of 847 in California. Its share of homes from before 1940 holds the grade up; its National Register listings pull it down.
C−
HistoryA character grade: shown, never part of South San Gabriel’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 South San Gabriel’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 is a Census survey estimate (±3.5 points).
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 South San Gabriel’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 South San Gabriel. Tap a year, or press play to watch the town change.
1896Pasadena 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 South San Gabriel.
The story so far
South San Gabriel, in brief
Wikipedia doesn’t have a history of South San Gabriel yet. The photos, dates and memories neighbors add here are how it gets written.
South San Gabriel is a census-designated place (CDP) in the San Gabriel Valley of Los Angeles County, California, United States. The population was 7,920 at the 2020 census, down from 8,070 at the 2010 census.
Its population held steady between the last two censuses: 8,070 in 2010, 7,920 in 2020.
Intro from Wikipedia. Population: U.S. Census Bureau.
By decade
No old photos in the archives yet
Weddings on Main Street, storms, parades, school pictures, the old store. If it’s in your family album, it belongs here.
Be the first to add onePhotograph a print flat, in daylight, no flash.
South San Gabriel is more historic than 24% of U.S. towns, #397 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.
How old are the homes in South San Gabriel?
7% of South San Gabriel’s homes were built before 1940 (Census estimate, ±3.5 points), against a typical 3.4% for a California town; the median home was built in 1962.
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 U.S. Geological Survey historical maps and U.S. Census counts (via Wikipedia). Archive images are copied here with their credits and licenses, shown on each photo’s page. Refreshed monthly.
