Green Valley is a community in Frederick County, Maryland, home to about 13,602 people across 17 square miles. Its ZIP code is 21770, and parts of 20871, 21754 and 21771 are in Green Valley too.
Homes sold for a median of $240 per square foot in the three months ending August 2026, a seller’s market.
Mostly Green Valley; also Monrovia
Mostly Clarksburg; part is in Green Valley
Mostly Urbana; part is in Green Valley
Mostly Mount Airy; part is in Green Valley
Each card is that ZIP code’s whole market, including any part outside Green Valley. Seller’s market: under 4 months of supply; buyer’s market: over 6. Methodology
We’re writing up Green Valley’s story and what everyday life there is like, for people thinking about moving in.
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| Nearest major airport | Washington Dulles International Airport (IAD)31 miles away |
|---|---|
| Nearest city of 250,000+ | Washington, DC33 miles away |
| Nearest city of 1 million+ | Philadelphia, PA120 miles away |
Straight-line distances from the center of Green Valley; 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.
Green Valley had 12,643 residents in the 2020 census, up 3% since 2000.
It’s the 108th 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 (6 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).
18 doctors and other health care providers list an office in Green Valley.
Nearest hospitals
Providers with an office here
| Dentists | 2 |
|---|---|
| Nurse practitioners and physician assistants | 5 |
| Mental health providers | 8 |
| Physical and occupational therapists | 2 |
| Chiropractors | 1 |
| Pharmacies | 3 |
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 (5 nearby)
Grocery stores (1 nearby)
Pharmacies (3 nearby)
Libraries
Museums
Counts are within about 3 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.
Public schools here are run by Frederick County Public Schools. Check each district’s attendance zones for a specific address.
| School | Grades | Students | Type | Distance |
|---|---|---|---|---|
| Green Valley ElementaryMonrovia | K–5 | 850 | Public | 2.0 mi |
| Kemptown ElementaryMonrovia | K–5 | 448 | Public | 1.6 mi |
Source: U.S. Department of Education, NCES: Common Core of Data (2024-2025) for public schools. Listed by address; we don’t rate schools.
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Shares ZIP codes with Clarksburg, Mount Airy, Urbana, Monrovia, Linganore and Bartonsville.
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.