Aztec’s post office opened in 1879, and 17 of its places are on the National Register
More historic than 49% of U.S. towns · #22 of 73 in New Mexico. What drives it
Most of Aztec was built recently: 3% of its homes predate 1940 and the median home dates from 1978. 17 places in town are on the National Register, among them three historic districts with 46 buildings between them. Below: 2 old photos and papers, maps from 1908 on, and the census since 1910.
Founding year: the first Aztec post office (Blevins & Helbock, CC0). Wikidata: 1887.
History grade
What drives Aztec’s History grade
On its age, its old homes and the National Register, Aztec is more historic than 49% of U.S. towns, #22 of 73 in New Mexico. Its National Register listings hold the grade up; its share of homes from before 1940 pulls it down.
B−
HistoryA character grade: shown, never part of Aztec’s overall grade.
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 Aztec’s 97.6 sits above most of its state (92% of New Mexico towns have fewer) while its 60 historic buildings outnumber those of 86% of U.S. towns.
How sure. Graded on any two of the three inputs instead, the letter would range from C− to B+. The pre-1940 share (±2.1 points) is firm at this size. The founding year is the first post office, not a stated founding date; Wikidata’s 1887 falls in the same era, so the grade doesn’t depend on which one is used.
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 Aztec’s past
Read from the archive, the National Register and the record. The page puts what stands out first.
National Park Service, National Register of Historic Places. Photos from Wikimedia Commons, credited on each place’s page.
The story so far
Aztec, in brief
Wikipedia doesn’t have a history of Aztec yet. The photos, dates and memories neighbors add here are how it gets written.
Aztec is a city in and the county seat of San Juan County, New Mexico, United States. The city population was 6,126 as of the 2022 population estimate. The Aztec Ruins National Monument is located in Aztec. The city was the site of the Aztec, New Mexico crashed saucer hoax, and it was near the site of the unrelated Project Gasbuggy, an underground nuclear detonation managed by the Atomic Energy Commission. The Aztec Museum hosts interpretive displays and preserved materials documenting each of the above. It also has materials related to the European-American settlement of the Aztec area.
Its first post office opened in 1879. Between the 2010 and 2020 censuses its population fell from 6,763 to 6,201 (-8%).
Intro from Wikipedia. Population: U.S. Census Bureau.
Timeline
Aztec, 1879 to 1992
Woven from the archive, old maps, post office records, the National Register and the people born here.
U.S. Geological Survey historical topographic maps (public domain), via Esri’s collection of the scans. The red ring marks the center of Aztec.
Every building
Aztec, building by building, 1908–1913
Fire insurance maps drew every building, what it was made of and what it was used for, so insurers could price the risk of fire. Pick a year, then a sheet.
1908Sheet 1 of 1
Edition
Sheets
BrickWoodStone
Sanborn Map Company, via the Library of Congress. Editions published in 1930 or earlier, which are in the public domain.
Then & now
Stand where they stood
No then-and-now pairs yet. Take a photo from the same spot as an old one and they appear here side by side.
Retake this viewAztec Ruins, West Ruin, New Mexico 44 near junction of U.S. 550
Find the spot, match the angle, and add your photo. It becomes the first then-and-now pair on Aztec’s page.
The Aztec post office opened in 1879, the earliest record of the town by name (U.S. post office records). Wikidata gives 1887.
How does Aztec rank for history?
Aztec is more historic than 49% of U.S. towns, #22 of 73 in New Mexico. 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 Aztec?
17 listings: 14 buildings and 3 historic districts, the Aztec Ruins National Monument, the Aztec Main Street Historic District and the Church Avenue-Lovers Lane Historic Ditrict, with 46 contributing buildings. 60 historic buildings in all.
How old are the homes in Aztec?
3% of Aztec’s homes were built before 1940 (Census estimate, ±2.1 points), against a typical 2.3% for a New Mexico town; the median home was built in 1978.
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 (10), the Library of Congress (2), Wikidata (12), the National Register of Historic Places (17), 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), the USGS Geographic Names Information System and Sanborn fire insurance maps (Library of Congress). Archive images are copied here with their credits and licenses, shown on each photo’s page. Refreshed monthly.
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