Each edition grades its towns against each other only.
More historic than 37% of U.S. towns. What drives it
Most of Cabin John was built recently: 5% of its homes predate 1940 and the median home dates from 1977. Its Register listing is the Cabin John Aqueduct. Below: 12 old photos and papers, maps from 1900 on, and the census since 2000.
The Cabin John post office opened in 1878, the earliest record of the town by name.
More historic than 37% of U.S. towns, on its age, its old homes and the National Register.
On its age, its old homes and the National Register, Cabin John is more historic than 37% of U.S. towns. Its National Register listings hold the grade up; its share of homes from before 1940 pulls it down.
Few Maryland towns list much on the Register (a typical Maryland town has 0.9 per 10,000 residents, the U.S. 2.4), so Cabin John’s 4.6 sits near the middle of its state (63% of Maryland towns have fewer) while its 1 listings outnumber those of 51% 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 →
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 Cabin John. Tap a year, or press play to watch the town change.
U.S. Geological Survey historical topographic maps (public domain), via Esri’s collection of the scans. The red ring marks the center of Cabin John.
6 decades in the archive, from the 1850s to the 1920s. Scroll each row; tap a photo for its story.
1859Construction of Cabin John Bridge, Maryland![[Construction of] Cabin John Bridge](https://images.townratings.com/story/40258/e370b49a3f0d8edf2969-s.jpg)
1859[Construction of] Cabin John Bridge
1861Cabin John Bridge, looking up stream
1861Distant view of Union Arch, Washington aqueduct, buil…
1861Near view of Union Arch, Washington aqueduct, built b…
1861Union Arch, built by Gen. M.C. Meigs, span of 220 feetFrom Wikipedia’s history of Cabin John.
Early land records in 1715 cite Captain John's Run, now called Cabin John Creek. The toponym "Cabin John" is thought to be a corruption of the name "Captain John", but the origin of the name remains unresolved.
Text from Wikipedia, licensed CC BY-SA 4.0.
Woven from the archive, old maps, post office records, the National Register and the people born here.
BuiltCabin John Aqueduct is builtIn the archiveConstruction of Cabin John Bridge, MarylandIn the archiveCabin John Bridge, looking up stream
In the archiveCabin John Bridge The largest stone arch in the world
In the archiveCabin John's Bridge
On the mapFirst mapped by the U.S. Geological Survey
In the archiveCabin John's rustic bridge
In the archiveElectric Institute of Washington. New houses at Cabin John, Maryland INo then-and-now pairs yet. Take a photo from the same spot as an old one and they appear here side by side.
Find the spot, match the angle, and add your photo. It becomes the first then-and-now pair on Cabin John’s page.
Retake this view · +15The country’s official list of buildings and places worth saving.
National Park Service, National Register of Historic Places. Photos from Wikimedia Commons, credited on each place’s page.
Between 1,734 and 2,459 people in every census since 2000.
3 censuses, 2000–2020.
U.S. Census Bureau decennial counts, from the census table on Cabin John’s Wikipedia page.
Cabin John’s post office has been open since 1878.
US Post Offices dataset (Blevins & Helbock, CC0). Places and cemeteries from the USGS Geographic Names Information System (2021).
Most archives stop around 1920. The photos from after that are in family albums, not libraries.
Each neighbor’s History grade, on the same three inputs.
The Cabin John post office opened in 1878, the earliest record of the town by name (U.S. post office records).
Cabin John is more historic than 37% 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.
One place: the Cabin John Aqueduct (listed 1973).
5% of Cabin John’s homes were built before 1940 (Census estimate, ±4.3 points), against a typical 3.3% for a Maryland town; the median home was built in 1977.
What the archives can’t tell you, neighbors can.
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 Library of Congress (12), the National Register of Historic Places (1), Wikipedia, U.S. Geological Survey historical maps, U.S. Census counts (via Wikipedia), 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.
1920
1920