On its age, its old homes and the National Register, Sea Ranch is more historic than 48% of U.S. towns. Its National Register listings hold the grade up; its share of homes from before 1940 pulls it down.
B−
HistoryA character grade: shown, never part of Sea Ranch’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 Sea Ranch’s 69.9 sits above most of its state (98% of California towns have fewer) while its 9 historic buildings outnumber those of 75% 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 (±0.9 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 Sea Ranch’s past
Read from the archive, the National Register and the record. The page puts what stands out first.
The first people known to live in the area were Pomos, who gathered kelp and shellfish from the beaches.
In 1846, Ernest Rufus received the Rancho German Mexican land grant, which extended along the coastline from the Gualala River to Ocean Cove. The land was later divided. In the early 1900s, Walter P. Frick bought up the pieces to create Del Mar Ranch, which was leased out for raising sheep. In 1941, the land was sold to Margaret Ohlson and her family.
Sea Ranch is more historic than 48% 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.
What is on the National Register in Sea Ranch?
5 listings: 5 buildings, among them the Knipp and Stengel Ranch Barn (listed 1987, the first). 9 historic buildings in all.
How old are the homes in Sea Ranch?
0.6% of Sea Ranch’s homes were built before 1940 (Census estimate), against a typical 3.4% for a California town; the median home was built in 1987.
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 (6), the National Register of Historic Places (5), 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.
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