On its age, its old homes and the National Register, Rockcreek is more historic than 9% of U.S. towns, #123 of 142 in Oregon. 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 Rockcreek’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 Rockcreek’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 two of the three inputs, so a change in either one moves the letter more than it would with three. The pre-1940 share (±2.4 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 Rockcreek’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 Rockcreek. Tap a year, or press play to watch the town change.
1915Hillsboro 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 Rockcreek.
The story so far
Rockcreek, in brief
Wikipedia doesn’t have a history of Rockcreek yet. The photos, dates and memories neighbors add here are how it gets written.
Rockcreek is a census-designated place in Washington County, Oregon, United States, north of U.S. Route 26. It is named for the Rock Creek neighborhood in the area. As of the 2020 census, Rockcreek had a population of 9,862. Named for Rock Creek, a tributary of the Tualatin River, that flows north to south through the neighborhood.
Between the 2010 and 2020 censuses its population grew from 9,316 to 9,862 (+6%).
Intro from Wikipedia. Population: U.S. Census Bureau.
Timeline
Rockcreek, 1878 to 1915
Woven from the archive, old maps, post office records, the National Register and the people born here.
Rockcreek is more historic than 9% of U.S. towns, #123 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 Rockcreek?
2% of Rockcreek’s homes were built before 1940 (Census estimate, ±2.4 points), against a typical 5.3% for an Oregon 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 Wikimedia Commons (5), U.S. Geological Survey historical maps, 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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