Trinidad’s post office opened in 1862, and 43% of its homes were built before 1940
More historic than 87% of U.S. towns · #2 of 159 in Colorado. What drives it
17 places in town are on the National Register, among them the Temple Aaron, a National Historic Landmark, and a historic district with 55 buildings. Below: 15 old photos and papers, maps from 1883 on, and the census since 1870.
Founding year: the first Trinidad post office (Blevins & Helbock, CC0).The full story ↓
History grade
What drives Trinidad’s History grade
On its age, its old homes and the National Register, Trinidad is more historic than 87% of U.S. towns, #2 of 159 in Colorado. Its share of homes from before 1940 holds the grade up; its age pulls it down.
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HistoryA character grade: shown, never part of Trinidad’s overall grade.
Few Colorado towns list much on the Register (a typical Colorado town has 1.1 per 10,000 residents, the U.S. 2.4), so Trinidad’s 89.3 sits above most of its state (94% of Colorado towns have fewer) while its 74 historic buildings outnumber those of 87% of U.S. towns.
How sure. Graded on any two of the three inputs instead, the letter would range from B+ to A+. The pre-1940 share is a Census survey estimate (±4.6 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 Trinidad’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.
Every building
Trinidad, building by building, 1883–1930
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.
Trinidad was first explored by Spanish and Mexican traders, who liked its proximity to the Santa Fe Trail. It was founded in 1862 soon after coal was discovered in the region. This led to an influx of immigrants eager to capitalize on this natural resource. By the late 1860s, the town had about 1,200 residents. Trinidad was officially incorporated in 1876, just a few months before Colorado became a state. In 1878 the Atchison, Topeka and Santa Fe Railway reached Trinidad, making it easier for goods to be shipped from distant locations. In the 1880s Trinidad became home to a number of well-known people, including Bat Masterson, who briefly served as the town's marshal in 1882. By 1900 Trinidad's population had grown to 7,500 and it had two English-language newspapers and one in Spanish. In 1885, Holy Trinity Catholic Church was constructed.
Nothing in the archives for these yearsWeddings on Main Street, storms, parades, school pictures, the old store. If it’s in your family album, it belongs here.
Animas MinemineBlack Diamond MinemineCentennial Public SchoolschoolHelen MinemineHenderson MinemineNew Mary MineminePark Street Public SchoolschoolRice Junior High SchoolschoolSanta Fe Public SchoolschoolStevens Minemine
2cemeteries and burying grounds inside Trinidad
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US Post Offices dataset (Blevins & Helbock, CC0). Places and cemeteries from the USGS Geographic Names Information System (2021).
Help out
Finish Trinidad’s story
Most archives stop around 1920. The photos from after that are in family albums, not libraries.
Decades since 1900 with photos
00s10s20s30s40s50s60s70s80s90s
1 of 10 decades. The empty ones are waiting for someone’s album.
The Trinidad post office opened in 1862, the earliest record of the town by name (U.S. post office records).
How does Trinidad rank for history?
Trinidad is more historic than 87% of U.S. towns, #2 of 159 in Colorado. 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 Trinidad?
17 listings: 15 buildings, among them the Baca House and Outbuilding (listed 1970, the first), and 1 historic district, the Corazon de Trinidad, with 55 contributing buildings. 74 historic buildings in all.
How old are the homes in Trinidad?
43% of Trinidad’s homes were built before 1940 (Census estimate, ±4.6 points), against a typical 2.5% for a Colorado town; the median home was built in 1953.
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 (12), the Library of Congress (3), Wikidata (3), the National Register of Historic Places (17), 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), 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.
★ Landmark
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