Mount Airy is a town in Frederick County, Maryland, home to about 9,805 people across 4.1 square miles. Its ZIP code is 21771.
Homes sold for a median of $241 per square foot in the three months ending August 2026, a seller’s market.
Mostly Mount Airy; also Green Valley
Each card is that ZIP code’s whole market, including any part outside Mount Airy. Seller’s market: under 4 months of supply; buyer’s market: over 6. Methodology
We’re writing up Mount Airy’s story and what everyday life there is like, for people thinking about moving in.
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| Nearest major airport | Baltimore/Washington International Thurgood Marshall Airport (BWI)31 miles away |
|---|---|
| Nearest city of 250,000+ | Baltimore, MD31 miles away |
| Nearest city of 1 million+ | Philadelphia, PA117 miles away |
Straight-line distances from the center of Mount Airy; driving is longer.
Source: Airports from OurAirports (scheduled passenger service); city centers and populations from the U.S. Census Bureau.
Source: Members of Congress from the congress-legislators project; districts from the Census Bureau’s relationship files; governor and mayor from Wikidata.
Mount Airy had 9,654 residents in the 2020 census, up 50% since 2000.
It’s the 141st largest of 527 towns in Maryland by population.
Frederick County grew from 51,920 residents in 1900 to 271,717 in 2020.
Frederick County, 1900–2020
Source: U.S. Census Bureau decennial censuses (counties 1900–1990 from the Bureau’s historical county file).
Average highs peak around 84°F in summer, and winter lows average 25°F. About 48 inches of rain and melted snow fall in a typical year, with about 31 inches of snow.
Source: NOAA 1991–2020 climate normals, Damascus 3 Ssw, MD weather station (9 miles away).
95,077 jobs at 6,591 businesses in Frederick County. The biggest industries by employees:
Source: U.S. Census Bureau County Business Patterns 2023 (private employers; jobs counted where people work).
158 doctors and other health care providers list an office in Mount Airy.
Nearest hospitals
Providers with an office here
| Primary care doctors | 11 |
|---|---|
| Specialist doctors | 7 |
| Dentists | 13 |
| Nurse practitioners and physician assistants | 29 |
| Mental health providers | 42 |
| Physical and occupational therapists | 42 |
| Optometrists | 7 |
| Chiropractors | 7 |
| Pharmacies | 10 |
Source: Hospitals from CMS Hospital General Information (ratings are CMS overall star ratings); straight-line distances; providers from the CMS National Plan and Provider Enumeration System (NPPES), by practice address and primary specialty.
Parks (11 nearby)
Grocery stores (1 nearby)
Pharmacies
Libraries
Museums (2 nearby)
Counts are within about 1.5 miles of the center of town.
Source: Map data © OpenStreetMap contributors (openstreetmap.org/copyright), as mapped by volunteers; it can miss places or include closed ones.
Established in 1830.
Notable people born here
Source: Wikidata (wikidata.org), the free knowledge base; people are listed by place of birth.
Public schools here are run by Carroll County Public Schools, Frederick County Public Schools. Check each district’s attendance zones for a specific address.
| School | Grades | Students | Type | Distance |
|---|---|---|---|---|
| Parr's Ridge ElementaryMt Airy | Pre-K–2 | 391 | Public | 1.5 mi |
| Twin Ridge ElementaryMt Airy | Pre-K–5 | 703 | Public | 1.2 mi |
| Mount Airy ElementaryMount Airy | 3–5 | 462 | Public | 1.3 mi |
| Mount Airy MiddleMount Airy | 6–8 | 761 | Public | 1.4 mi |
| School | Grades | Students | Affiliation | Distance |
|---|---|---|---|---|
| Mount Airy Christian AcademyMount Airy | Pre-K–12 | 416 | Christian (no specific denomination) | 4.9 mi |
| Cornerstone AcademyMount Airy | 6–12 | 22 | Other religious | 5.8 mi |
Source: U.S. Department of Education, NCES: Common Core of Data (2024-2025) for public schools; Private School Universe Survey (2023-2024) for private schools. Listed by address; we don’t rate schools.
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Shares ZIP codes with Green Valley.
Town boundaries don’t always match ZIP codes: a ZIP code can cross into neighboring towns, and a town can share a ZIP code with its neighbors. Facts describe the town itself; market figures describe whole ZIP codes.