The Red Rock post office opened in 1887, the earliest record of the town by name. Another post office, Sasco (1907), opened inside today’s town and later closed.
2020 census: 2,625139 years
How historic is Red Rock?
C
More historic than 29% of U.S. towns, on its age, its old homes and the National Register.
Founding year: the first Red Rock post office (Blevins & Helbock, CC0).
History grade
What drives Red Rock’s History grade
On its age, its old homes and the National Register, Red Rock is more historic than 29% of U.S. towns, #43 of 140 in Arizona. Its share of homes from before 1940 holds the grade up; its National Register listings pull it down.
C
HistoryA character grade: shown, never part of Red Rock’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 Red Rock’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 any two of the three inputs instead, the letter would range from C− to C+. The pre-1940 share is a Census survey estimate (±15.9 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 Red Rock’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 Red Rock yet. The photos, dates and memories neighbors add here are how it gets written.
Red Rock is a census-designated place (CDP) in South-Central Pinal County, Arizona, United States, located along Interstate 10. In 2010, it had a population of 2,169. The elevation is 1,865 feet (568 m), according to the water tower. Mostly agricultural land until recent times, it is now starting to acquire some tract home communities. The area also consists of large sections of undeveloped Sonoran Desert. Picacho Peak State Park is located about six miles northwest of Red Rock. Red Rock also has a school called Red Rock Elementary school which goes from kindergarten through eighth grade. Also home to the Saguaro Power Plant and the Saguaro Solar Power Station - a 1 MW solar trough concentr…
Its first post office opened in 1887. Between the 2010 and 2020 censuses its population grew from 169 to 2,625 (+1453%).
Intro from Wikipedia. Population: U.S. Census Bureau.
Timeline
Red Rock, 1887 to 1947
Woven from the archive, old maps, post office records, the National Register and the people born here.
Lost post offices, old corners and burying grounds
Red Rock’s post office has been open since 1887. Another post office, Sasco, opened and closed inside today’s town.
Red Rock
1887–today
Sasco
1907–1919
18801950today
Hamlets and corners on the map
Avra
1cemetery inside Red Rock
Sasco
US Post Offices dataset (Blevins & Helbock, CC0). Places and cemeteries from the USGS Geographic Names Information System (2021).
Questions about Red Rock’s history
What year was Red Rock founded?
The Red Rock post office opened in 1887, the earliest record of the town by name (U.S. post office records).
How does Red Rock rank for history?
Red Rock is more historic than 29% of U.S. towns, #43 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 Red Rock?
10% of Red Rock’s homes were built before 1940 (Census estimate, ±15.9 points), against a typical 0.4% for an Arizona town; the median home was built in 2008.
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 (6), 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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