Union Bridge is a town in Frederick County, Maryland, home to about 1,055 people across 1.0 square miles. It has no ZIP code of its own: it’s part of 21791.
Homes sold for a median of $188 per square foot in the three months ending August 2026, a seller’s market.
Part is in Union Bridge, part in Libertytown
Each card is that ZIP code’s whole market, including any part outside Union Bridge. Seller’s market: under 4 months of supply; buyer’s market: over 6. Methodology
We’re writing up Union Bridge’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)37 miles away |
|---|---|
| Nearest city of 250,000+ | Baltimore, MD34 miles away |
| Nearest city of 1 million+ | Philadelphia, PA110 miles away |
Straight-line distances from the center of Union Bridge; 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.
Union Bridge had 936 residents in the 2020 census, down 5% since 2000.
It’s the 329th 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 85°F in summer, and winter lows average 22°F. About 46.8 inches of rain and melted snow fall in a typical year, with about 28 inches of snow.
Source: NOAA 1991–2020 climate normals, Emmitsburg 2 Se, MD weather station (10 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).
6 doctors and other health care providers list an office in Union Bridge.
Nearest hospitals
Providers with an office here
| Primary care doctors | 1 |
|---|---|
| Dentists | 1 |
| Nurse practitioners and physician assistants | 2 |
| Mental health providers | 2 |
| Pharmacies | 1 |
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
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 Carroll County Public Schools. Check each district’s attendance zones for a specific address.
| School | Grades | Students | Type | Distance |
|---|---|---|---|---|
| Elmer A. Wolfe ElementaryUnion Bridge | Pre-K–5 | 502 | Public | 2.4 mi |
| Francis Scott Key HighUnion Bridge | 9–12 | 906 | Public | 0.9 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 Libertytown.
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.