Black Rock’s post office opened in 1904
More historic than 2% of U.S. towns. What drives it
Most of Black Rock was built recently: 0.0% of its homes predate 1940 and the median home dates from 1997.
How Black Rock began
When was Black Rock founded?
The Black Rock post office opened in 1904, the earliest record of the town by name.
How historic is Black Rock?
More historic than 2% of U.S. towns, on its age, its old homes and the National Register.
What drives Black Rock’s History grade
On its age, its old homes and the National Register, Black Rock 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.
New Mexico towns list about as much on the Register as the country (a typical New Mexico town has 2.2 per 10,000 residents, the U.S. 2.4), so Black Rock’s 0.0 sits below most of its state (28% of New Mexico towns have fewer) while its 0 listings outnumber those of 23% of U.S. towns.
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 →
Lost post offices and places now gone
Black Rock had its own post office from 1904 to 1926.
US Post Offices dataset (Blevins & Helbock, CC0). Places and cemeteries from the USGS Geographic Names Information System (2021).
History across the town line
Each neighbor’s History grade, on the same three inputs.
Questions about Black Rock’s history
What year was Black Rock founded?
The Black Rock post office opened in 1904, the earliest record of the town by name (U.S. post office records).
How does Black Rock rank for history?
Black Rock 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 Black Rock?
0.0% of Black Rock’s homes were built before 1940 (Census estimate, ±4.2 points), against a typical 2.3% for a New Mexico town; the median home was built in 1997.
Memory lane
What the archives can’t tell you, neighbors can.
Where this page comes from
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 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.