Horace and Marilda Parsons settled in the area located south of Forest Grove in 1849. In 1850, Parsons built a grist mill along the Tualatin River near what later became Dilley on the land claim of William Owen Gibson. Gibson settled his claim in 1847, and built the log cabin used for Tabitha Moffatt Brown’s orphan school that later became Pacific University. Dilley School District 10 was established in 1860, with a school built on the north end of the town that same year. A flour mill was added nearby in 1863, and Joseph Gaston’s West Side Railroad reached the area in 1872. James C. Chamberlain, was the first postmaster of the post office established on December 31, 1873.
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). How TownRatings grades history →
From Wikimedia Commons (3), Wikipedia, 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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