Mount Airy dates to 1830, and 1 of its places is on the National Register
More historic than 80% of U.S. towns · #33 of 261 in Maryland. What drives it
Most of Mount Airy was built recently: 8% of its homes predate 1940 and the median home dates from 1995. 1 place in town is on the National Register, among them a historic district with 171 buildings. Below: maps from 1904 on and the census since 1880.
Founding year: Wikidata; Wikipedia’s history section gives the same year. First post office: 1844.The full story ↓
History grade
What drives Mount Airy’s History grade
On its age, its old homes and the National Register, Mount Airy is more historic than 80% of U.S. towns, #33 of 261 in Maryland. Its National Register listings hold the grade up; its share of homes from before 1940 pulls it down.
A−
HistoryA character grade: shown, never part of Mount Airy’s overall grade.
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 Mount Airy’s 174 sits above most of its state (86% of Maryland towns have fewer) while its 171 historic buildings outnumber those of 92% 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 (±2.0 points) is firm at this size. Two sources give 1830.
Founding year: Wikidata (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 Mount Airy’s past
Read from the archive, the National Register and the record. The page puts what stands out first.
The community was first settled in 1830 and continued to develop throughout the decade, beginning with the construction of house settlements along Parr's Ridge. A man named Henry Bussard built the first of these houses. This town was known for its train station on the Baltimore and Ohio Railroad (B&O) at Parr's Ridge. The railroad ran from Baltimore to Frederick, cities to the east and west, respectively, of Mt. Airy. Following 1830, the town received its official name after the suggestion of "Mount Airy" from an Irish B&O worker who complained about his freezing ears on a windy work day. Over the years, milling, canning and sewing industries initially helped support Mt. Airy's economy.
Every edition of the U.S. Geological Survey’s map of Mount Airy. Tap a year, or press play to watch the town change.
1909Mount Airy 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 Mount Airy.
Every building
Mount Airy, building by building, 1904–1911
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.
1904Sheet 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.
People over time
Mount Airy, census by census
Grew from 91 people in 1880 to 9,654 in 2020, more than tenfold.
14 censuses, 1880–2020.
U.S. Census Bureau decennial counts, from the census table on Mount Airy’s Wikipedia page.
Famous people
8 famous people were born in Mount Airy
Writers, athletes, leaders and more, ranked by how widely they’re known.
In 1830, according to Wikidata and Wikipedia’s history of the town. Mount Airy’s post office opened in 1844, and the census of 1880 counted 91 people here.
How does Mount Airy rank for history?
Mount Airy is more historic than 80% of U.S. towns, #33 of 261 in Maryland. 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 Mount Airy?
One place: the Mount Airy Historic District (listed 1984).
How old are the homes in Mount Airy?
8% of Mount Airy’s homes were built before 1940 (Census estimate, ±2.0 points), against a typical 3.3% for a Maryland town; the median home was built in 1995.
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 (6), the National Register of Historic Places (1), 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.
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