Each edition grades its towns against each other only.
More historic than 39% of U.S. towns. What drives it
Below: 3 old photos and papers, maps from 1890 on, and the census since 1880.
Plymouth dates its founding to 1853 (Wikidata). The census first counted it in 1880.
More historic than 39% of U.S. towns, on its age, its old homes and the National Register.
On its age, its old homes and the National Register, Plymouth is more historic than 39% of U.S. towns. Its share of homes from before 1940 holds the grade up; its National Register listings pull it down.
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 Plymouth’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.
Founding year: Wikidata (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 →
Read from the archive, the National Register and the record. The page puts what stands out first.
The first neighbors to add old photos shape how Plymouth’s history is told.
Lost half of its people between 1890 and 1930, then grew 3-fold.
13 censuses, 1880–2020.
U.S. Census Bureau decennial counts, from the census table on Plymouth’s Wikipedia page.
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.
1890Sheet 1 of 1Sanborn Map Company, via the Library of Congress. Editions published in 1930 or earlier, which are in the public domain.
From Wikipedia’s history of Plymouth.
A post office was opened in 1871. The city incorporated in 1917. The Plymouth Trading Post is a registered as California Historical Landmark #41.
According to the Köppen Climate Classification system, Plymouth has a warm-summer Mediterranean climate, abbreviated "Csa" on climate maps.
Text from Wikipedia, licensed CC BY-SA 4.0.
Passages that mention Plymouth, cut from the printed page as they were published.
The Committee of both Houses, to whom was referred the petition of Asa Howard and others, praying that the North Precinct, in the town of Bridgewater, in the County of Plymouth, may be set off from Bridgewater, and incorporated into a separate town, have had the same under consideration, and ask leave to report that the prayer of the petition be so far granted that the petitioners have leave to bring in a bill for that purpose.
Text read by machine from the scan; it may contain errors.
AMONG the early coal operations in Plymouth, the Gaylord mine and railroad has already been described. There was another similar railroad extending to the river which is now known as the Bull Run Railroad, and on which the cars were propelled by gravity from the old mine now owned by the D. & H. Co. and located in Poke Hollow. This mine, I think, was first operated by William Patton, and afterwards by David
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.
Woven from the archive, old maps, post office records, the National Register and the people born here.
On the mapFirst mapped by the U.S. Geological SurveyEvery edition of the U.S. Geological Survey’s map of Plymouth. Tap a year, or press play to watch the town change.
U.S. Geological Survey historical topographic maps (public domain), via Esri’s collection of the scans. The red ring marks the center of Plymouth.
No then-and-now pairs yet. Take a photo from the same spot as an old one and they appear here side by side.
Find the spot, match the angle, and add your photo. It becomes the first then-and-now pair on Plymouth’s page.
Retake this view · +15Plymouth’s post office has been open since 1871.
US Post Offices dataset (Blevins & Helbock, CC0). Places and cemeteries from the USGS Geographic Names Information System (2021).
In 1853, according to Wikidata. Plymouth’s post office opened in 1871, and the census of 1880 counted 740 people here.
Plymouth is more historic than 39% 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.
17% of Plymouth’s homes were built before 1940 (Census estimate, ±9.9 points), against a typical 3.4% for a California town; the median home was built in 1987.
What the archives can’t tell you, neighbors can.
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 (7), the Library of Congress (1), Wikipedia, Wikidata and Wikipedia for famous people, 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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