On its age, its old homes and the National Register, Williamson is more historic than 9% of U.S. towns, #93 of 140 in Arizona. 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 Williamson’s overall grade.
Few Arizona towns list much on the Register (a typical Arizona town has 0.1 per 10,000 residents, the U.S. 2.4), so Williamson’s 0.0 sits below most of its state (29% of Arizona 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 (±0.8 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 Williamson’s past
Read from the archive, the National Register and the record. The page puts what stands out first.
Wikipedia doesn’t have a history of Williamson yet. The photos, dates and memories neighbors add here are how it gets written.
Williamson is a census-designated place (CDP) in Yavapai County, Arizona, United States. The population was 3,776 at the 2000 census and 6,196 at the 2020 census. The name "Wiliamson" is a misnomer, perhaps propagated by federal bureaucratic error; the area has long been known as "Williamson Valley" after the major road through the area, Williamson Valley Road.
Between the 2010 and 2020 censuses its population grew from 5,438 to 6,196 (+14%).
Intro from Wikipedia. Population: U.S. Census Bureau.
Williamson is more historic than 9% of U.S. towns, #93 of 140 in Arizona. 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 Williamson?
0.7% of Williamson’s homes were built before 1940 (Census estimate), against a typical 0.4% for an Arizona town; the median home was built in 1998.
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 (2), U.S. Geological Survey historical maps 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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