Wikipedia doesn’t have a history of Philo yet. The photos, dates and memories neighbors add here are how it gets written.
Philo is a census-designated place in Mendocino County, California, United States. It is located 6 miles (10 km) northwest of Boonville, at an elevation of 331 feet (101 m). The population was 319 at the 2020 census. Philo is located in Anderson Valley in western Mendocino County. Situated along Indian Creek as it flows into the Navarro River, Philo is the home of KZYX, the local public radio station. Two small specialty lumber mills in Philo are all that remain of a once vigorous timber economy in Anderson Valley. Philo is the heart of the Anderson Valley wine region. The first post office opened in 1888. The ZIP Code is 95466. The community is inside area code 707. Two versions of how Phi…
Its first post office opened in 1888. Between the 2010 and 2020 censuses its population fell from 349 to 319 (-9%).
Intro from Wikipedia. Population: U.S. Census Bureau.
Timeline
Philo, 1888 to 1971
Woven from the archive, old maps, post office records, the National Register and the people born here.
Nothing in the archives for these yearsWeddings on Main Street, storms, parades, school pictures, the old store. If it’s in your family album, it belongs here.
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 (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.