Most of St. Michaels was built recently: 0.0% of its homes predate 1940 and the median home dates from 1998. Below: 2 old photos and papers, maps from 1955 on, and the census since 1990.
Founding year: the first St. Michaels post office (Blevins & Helbock, CC0).The full story ↓
History grade
What drives St. Michaels’ History grade
On its age, its old homes and the National Register, St. Michaels is more historic than 2% of U.S. towns. Its National Register listings hold the grade up; its share of homes from before 1940 pulls it down.
D−
HistoryA character grade: shown, never part of St. Michaels’ 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 St. Michaels’ 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 any two of the three inputs instead, the letter would range from D− to D. The pre-1940 share is a Census survey estimate (±3.5 points). The founding year is the first post office, not a stated founding date.
Founding year: the first post office (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 St. Michaels’ past
Read from the archive, the National Register and the record. The page puts what stands out first.
The St. Michaels area is referred to as Ts'ithootso in the Navajo language and translates to "area that extends out in yellow and green." The microclimate was originally referred to by its Spanish translation Ciénega Amarilla (Spanish: "yellow meadow") describing the late summer yellow flowers and grass. The area was first noted by the U.S. military in 1850 when Lt. James Harvey Simpson named it Sieneguilla de Maria, its Spanish name misheard by a non-native speaker.
In the 1850s a planned ambush against local Navajos was thwarted by a man who went on to become a signatory to the Navajo Treaty of 1868. Delgadito (Chách'oshnééz ((“Tall Syphilis”)) successfully alerted Navajos preparing for a prisoner exchange with Mexican slave-holders.
The St. Michaels post office opened in 1902, the earliest record of the town by name (U.S. post office records).
How does St. Michaels rank for history?
St. Michaels is more historic than 2% of U.S. towns. 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 St. Michaels?
0.0% of St. Michaels’ homes were built before 1940 (Census estimate, ±3.5 points), 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), Wikipedia, Wikidata and Wikipedia for famous people, 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.
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