Most of Keystone was built recently: 0.3% of its homes predate 1940 and the median home dates from 1992. 1 place in town is on the National Register, among them a historic district with 6 buildings. Below: maps from 1924 on and the census since 2000.
On its age, its old homes and the National Register, Keystone is more historic than 21% of U.S. towns. Its National Register listings hold the grade up; its age pulls it down.
C−
HistoryA character grade: shown, never part of Keystone’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 Keystone’s 49.3 sits above most of its state (87% of Colorado towns have fewer) while its 6 historic buildings outnumber those of 72% of U.S. towns.
How sure. Graded on any two of the three inputs instead, the letter would range from D− to C+. The pre-1940 share (±0.6 points) is firm at this size.
Founding year: the first census (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 Keystone’s past
Read from the archive, the National Register and the record. The page puts what stands out first.
Every edition of the U.S. Geological Survey’s map of Keystone. Tap a year, or press play to watch the town change.
1924Montezuma sheet · 1:62,500
U.S. Geological Survey historical topographic maps (public domain), via Esri’s collection of the scans. The red ring marks the center of Keystone.
The story so far
Keystone, in brief
Wikipedia doesn’t have a history of Keystone yet. The photos, dates and memories neighbors add here are how it gets written.
Keystone is a home rule town located in Summit County, Colorado, United States. The town is a part of the Breckenridge, CO Micropolitan Statistical Area. Keystone residents voted to incorporate on March 28, 2023, becoming a municipality on April 3, 2023. The municipality includes the Keystone Resort and Keystone Village. The population of the former Keystone census-designated place (CDP) was 1,369 at the United States Census 2020. However, the boundary of the current municipality encompasses a smaller geographic area than the boundary of the former CDP. The United States Census Bureau estimated the population of the Town of Keystone as 1,274 on July 1, 2025. The Dillon post office (Zip Code…
Its first post office opened in 2000. Between the 2010 and 2020 censuses its population grew from 1,079 to 1,369 (+27%).
Intro from Wikipedia. Population: U.S. Census Bureau.
The Keystone post office opened in 2000, the earliest record of the town by name (U.S. post office records).
How does Keystone rank for history?
Keystone is more historic than 21% 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.
What is on the National Register in Keystone?
One place: the Soda Creek Ranch (listed 2010).
How old are the homes in Keystone?
0.3% of Keystone’s homes were built before 1940 (Census estimate), against a typical 2.5% for a Colorado town; the median home was built in 1992.
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 (18), the National Register of Historic Places (1), U.S. Geological Survey historical maps, U.S. Census counts (via Wikipedia) 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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