Dewey-Humboldt was first counted by the census in 1990, and 1 of its places is on the National Register
More historic than 18% of U.S. towns · #66 of 140 in Arizona. What drives it
Most of Dewey-Humboldt was built recently: 3% of its homes predate 1940 and the median home dates from 1995. Its Register listing is the Woolsey Ranchhouse Ruins. Below: maps from 1905 on and the census since 1990.
Dewey-Humboldt first appears in the census in 1990. Two smaller post offices, Valverde (1899) and Iron King (1907), opened inside today’s town and later closed.
First census: 3,640 in 19902020 census: 4,32636 years
How historic is Dewey-Humboldt?
C−
More historic than 18% of U.S. towns, on its age, its old homes and the National Register.
On its age, its old homes and the National Register, Dewey-Humboldt is more historic than 18% of U.S. towns, #66 of 140 in Arizona. Its National Register listings hold the grade up; its age pulls it down.
C−
HistoryA character grade: shown, never part of Dewey-Humboldt’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 Dewey-Humboldt’s 2.2 sits above most of its state (66% of Arizona towns have fewer) while its 1 listings outnumber those of 51% 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 (±2.1 points) is firm at this size.
Founding year: the first census (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 Dewey-Humboldt’s past
Read from the archive, the National Register and the record. The page puts what stands out first.
Lost post offices, old corners, places now gone and burying grounds
Two other post offices opened and closed inside today’s town.
Valverde
1899–1905
Humboldt
1905–today
Iron King
1907–1912
18901960today
Hamlets and corners on the map
Blue Hills FarmsHumboldt
Gone or out of use
Iron King Minemine
2cemeteries and burying grounds inside Dewey-Humboldt
HendersonHumboldt
US Post Offices dataset (Blevins & Helbock, CC0). Places and cemeteries from the USGS Geographic Names Information System (2021).
The story so far
Dewey-Humboldt, in brief
Wikipedia doesn’t have a history of Dewey-Humboldt yet. The photos, dates and memories neighbors add here are how it gets written.
Dewey–Humboldt is a town in Yavapai County, Arizona, United States. The population of the town was 3,894 according to the 2010 census. The Dewey–Humboldt area was a census-designated place (CDP) at the 2000 census, at which time its population was 3,453.
Its first post office opened in 1990. Between the 2010 and 2020 censuses its population grew from 3,894 to 4,326 (+11%).
Intro from Wikipedia. Population: U.S. Census Bureau.
Timeline
Dewey-Humboldt, 1899 to 1912
Woven from the archive, old maps, post office records, the National Register and the people born here.
Every edition of the U.S. Geological Survey’s map of Dewey-Humboldt. Tap a year, or press play to watch the town change.
1905Jerome sheet · 1:125,000
U.S. Geological Survey historical topographic maps (public domain), via Esri’s collection of the scans. The red ring marks the center of Dewey-Humboldt.
On the National Register
1 historic place in Dewey-Humboldt
The country’s official list of buildings and places worth saving.
The Dewey-Humboldt post office opened in 1990, the earliest record of the town by name (U.S. post office records). Wikidata gives 2004.
How does Dewey-Humboldt rank for history?
Dewey-Humboldt is more historic than 18% of U.S. towns, #66 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.
What is on the National Register in Dewey-Humboldt?
One place: the Woolsey Ranchhouse Ruins (listed 1977).
How old are the homes in Dewey-Humboldt?
3% of Dewey-Humboldt’s homes were built before 1940 (Census estimate, ±2.1 points), against a typical 0.4% for an Arizona town; the median home was built in 1995.
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 the National Register of Historic Places (1), 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.
