Monrovia is a community in Frederick County, Maryland, home to about 3,568 people across 2.3 square miles. It has no ZIP code of its own: it’s part of 21770.
Homes sold for a median of $240 per square foot in the three months ending August 2026, a seller’s market.
Mostly Green Valley; part is in Monrovia
Each card is that ZIP code’s whole market, including any part outside Monrovia. Seller’s market: under 4 months of supply; buyer’s market: over 6. Methodology
We’re writing up Monrovia’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)30 miles away |
|---|---|
| Nearest city of 250,000+ | Washington, DC33 miles away |
| Nearest city of 1 million+ | Philadelphia, PA121 miles away |
Straight-line distances from the center of Monrovia; 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.
Monrovia had 2,702 residents in the 2020 census, up 550% since 2010.
It’s the 237th 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 Monrovia.
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.
Grocery stores
Pharmacies (1 nearby)
Libraries
Museums
Counts are within about 1 mile 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 | 1.0 mi |
| Kemptown ElementaryMonrovia | K–5 | 448 | Public | 1.7 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 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.