More historic than 14% of U.S. towns · #112 of 142 in Oregon. What drives it
Most of Happy Valley was built recently: 1% of its homes predate 1940 and the median home dates from 2009. Below: maps from 1914 on and the census since 1970.
Founding year: Wikipedia. First post office: 1888.The full story ↓
History grade
What drives Happy Valley’s History grade
On its age, its old homes and the National Register, Happy Valley is more historic than 14% of U.S. towns, #112 of 142 in Oregon. Its age holds the grade up; its share of homes from before 1940 pulls it down.
D
HistoryA character grade: shown, never part of Happy Valley’s overall grade.
Oregon towns list more on the Register than most of the country (a typical Oregon town has 2.9 per 10,000 residents, the U.S. 2.4), so Happy Valley’s 0.0 sits below most of its state (18% of Oregon towns have fewer) while its 0 listings outnumber those of 23% of U.S. towns.
How sure. Graded on any two of the three inputs instead, the letter would range from D to C−. The pre-1940 share (±0.8 points) is firm at this size. Two sources give 1850.
Founding year: Wikipedia (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 Happy Valley’s past
Read from the archive, the National Register and the record. The page puts what stands out first.
Happy Valley was originally settled by Christian and Matilda Deardorff after receiving 640 acres from The Donation Land Claim Act of 1850 in Clackamas County between a cinder cone volcano later name Mt. Scott and a knoll later named Scouters' Mountain. The settled region become known as Deardorff Valley, Deardorff Settlement and most popularly Christilla Valley (name formed by combining "Chris" from Christian and "Tilla" from Matilda).
The city was officially incorporated in 1965 and remained a small community until the late 1990s, when it became one of the fastest-growing cities in Oregon.
In 1850, according to Wikipedia’s history of the town. Happy Valley’s post office opened in 1888, and the census of 1970 counted 1,392 people here.
How does Happy Valley rank for history?
Happy Valley is more historic than 14% of U.S. towns, #112 of 142 in Oregon. 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 Happy Valley?
1% of Happy Valley’s homes were built before 1940 (Census estimate), against a typical 5.3% for an Oregon town; the median home was built in 2009.
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), 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) 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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