Union Bridge ZIP Codes — Carroll County, MD

There is one unique ZIP code in Union Bridge, Maryland and it is 21791. Area code: 443/410/667.

ZIP codes

46.04

sq mi land

0.08

sq mi water

443/410/667

area code

Union Bridge, MD ZIP code map

About Union Bridge, MD

Union Bridge is a charming town located in Carroll County, Maryland. Known for its warm community atmosphere, it serves as a peaceful residential area just outside the hustle and bustle of larger cities. Visitors and residents alike appreciate the town's rich historical background and small-town charm.

Location & geography

Union Bridge is situated approximately 15 miles northwest of Westminster and about 12 miles east of Frederick, making it a convenient spot for commuters. The town covers a land area of 46.04 square miles, complemented by a water area of 0.08 square miles. The terrain is a mix of pastoral landscapes and wooded areas, providing a picturesque setting for outdoor activities.

Community & economy

The community in Union Bridge is characterized by its friendly residents and strong local spirit, reflecting the traditional values of rural life. The local economy is supported by small businesses and agriculture, which form the backbone of daily life in the area. Residents enjoy a slower pace of life, with community events and gatherings that foster a close-knit environment.

Transportation

Union Bridge is accessible via several major highways, including Maryland Route 75 and Maryland Route 140, allowing easy travel to neighboring areas. The nearest airports are located in Baltimore and Washington, D.C., providing additional connectivity for residents. Public transportation options are limited, emphasizing the town's rural character.

History

Founded in the early 19th century, Union Bridge has a rich history tied to the development of railroads and agriculture in the region. Historically, it served as an important hub for local farming communities and industries such as milling. Notable events include the town's incorporation in 1882, which marked its official recognition and development.

Did you know?

One surprising fact about Union Bridge is that it is home to the annual Union Bridge Community Day, which celebrates local heritage and encourages community involvement. Additionally, the town boasts a unique railroad history, evidenced by remnants of its past that can be seen in the area today.

ZIP codes for Union Bridge, MD (1)

ZIP code	City	County	Map
21791	Union Bridge	Carroll	View map

Demographics & statistics

4,855

Population

42.6

Median age

$88,984

Median household income

$42,725

Per capita income

$349,900

Median home value

$1,156

Median monthly rent

81.4%

Home ownership

9.8%

Poverty rate

2.6%

Unemployment

1,640

Housing units

25.9%

Bachelor's or higher

Age distribution

Male Female

155

Under 5

131

5–9

149

10–14

126

213

15–19

180

152

20–24

129

326

25–34

276

327

35–44

277

300

45–54

254

213

55–59

179

220

60–64

186

253

65–74

213

132

75–84

112

110

85+

← Male

Female →

Age summary

Group	Count	%
Under 18	989	20.4%
18 and over	3,866	79.6%
65 and over	912	18.8%
Median age	42.6 years

Race & ethnicity

White 94.5%

Asian 1.7%

Two or more races 1.3%

Black or African American 1.1%

Hispanic or Latino 0.6%

Other race 0.5%

Native Hawaiian / Pacific Islander 0.2%

American Indian / Alaska Native 0.1%

Group	Count	%
White	4,617	94.5%
Asian	81	1.7%
Two or more races	63	1.3%
Black or African American	53	1.1%
Hispanic or Latino	30	0.6%
Other race	26	0.5%
Native Hawaiian / Pacific Islander	10	0.2%
American Indian / Alaska Native	5	0.1%

Household income

Under $10k 1.4%

$10k–$15k 3.4%

$15k–$25k 4.5%

$25k–$35k 5.2%

$35k–$50k 7.9%

$50k–$75k 19.8%

$75k–$100k 11.3%

$100k–$150k 21.9%

$150k–$200k 14.4%

$200k+ 10.1%

Range	% of households
Under $10k	1.4%
$10k–$15k	3.4%
$15k–$25k	4.5%
$25k–$35k	5.2%
$35k–$50k	7.9%
$50k–$75k	19.8%
$75k–$100k	11.3%
$100k–$150k	21.9%
$150k–$200k	14.4%
$200k+	10.1%
Median income	$88,984

Housing

Home values

Under $50k 1.8%

$50k–$100k 0.2%

$100k–$150k 4.7%

$150k–$200k 6.8%

$200k–$300k 22.5%

$300k–$500k 40.9%

$500k–$1M 19.5%

$1M+ 3.6%

Housing overview

Metric	Value
Median home value	$349,900
Median rent / month	$1,156
Owner occupied	81.4%
Renter occupied	18.6%
Vacant	5.5%
Single-family detached	90.5%
Large apartment buildings	0.0%
Mobile homes	0.4%
Median rooms	6.9
Avg household size (owned)	2.67

Year built

Era	%
2020 or later	0.6%
2010–2019	1.6%
2000–2009	6.4%
1990–1999	5.8%
1980–1989	8.9%
1970–1979	13.6%
1960–1969	15.5%
1950–1959	4.2%
1940–1949	5.7%
1939 or earlier	37.7%

Bedrooms

Size	% of units
No bedroom (studio)	0.2%
1 bedroom	5.5%
2 bedrooms	18.1%
3 bedrooms	48.4%
4 bedrooms	21.8%
5+ bedrooms	6.1%

Vehicles per household

Vehicles	% of households
No vehicle	2.1%
1 vehicle	19.7%
2 vehicles	31.8%
3 or more	46.4%

Heating fuel

Fuel type	%
Utility gas	1.2%
Electricity	39.3%
Propane / LP gas	7.0%
Fuel oil	36.6%
Wood	12.5%
No fuel used	1.2%

Households & families

Household type	Count	%
Married-couple family	1,057	56.3%
Cohabiting couple	167	8.9%
Male householder, no spouse	416	22.1%
Female householder, no spouse	239	12.7%
Households with children under 18	561	29.9%
Households with seniors (65+)	612	32.6%
Average household size	2.58

Marital status

Status	Male	Female
Never married	35.6%	23.0%
Married	51.2%	57.2%
Separated	0.4%	0.9%
Widowed	3.6%	5.0%
Divorced	9.2%	13.8%

Education

Less than 9th grade 3.5%

Some HS, no diploma 3.6%

HS graduate 44.1%

Some college, no degree 19.9%

Associate's degree 3.0%

Bachelor's degree 15.1%

Graduate / professional 10.8%

Metric	%
HS diploma or higher	92.9%
Bachelor's or higher	25.9%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	48	5.1%
Kindergarten	21	2.2%
Elementary school	388	41.2%
High school	334	35.5%
College / grad school	151	16.0%

Employment

Industry of employment

Professional & management 15.5%

Construction 13.5%

Education & healthcare 10.6%

Public administration 10.0%

Retail trade 9.5%

Arts, food & hospitality 7.4%

Other services 7.2%

Manufacturing 7.0%

Transportation & utilities 6.5%

Agriculture & mining 5.8%

Finance & real estate 3.9%

Information 2.0%

Wholesale trade 1.1%

Occupation

Category	%
Management, business & arts	32.3%
Service	21.4%
Sales & office	16.7%
Natural resources & construction	16.3%
Production & transportation	13.2%

Employment type

Type	%
Private sector	68.1%
Government	20.5%
Self-employed	9.1%
Unpaid family workers	2.2%

Commute

Method	%
Drive alone	86.3%
Carpool	4.2%
Public transit	0.0%
Walk	1.4%
Other means	0.2%
Avg commute (minutes)	37.2

Poverty

All people 9.8%

Under 18 years 11.6%

18 and over 9.3%

Married-couple families 1.8%

Female-led households 43.3%

Income support

Source	% of households
Social Security	32.7%
Retirement income	25.7%
Supplemental Security	4.0%
Cash public assistance	3.0%
Food stamps / SNAP	8.1%

Health indicators

Condition	%
High blood pressure	34.6%
High cholesterol	36.5%
Heart disease	6.3%
Stroke	2.9%
Asthma	9.7%
Arthritis	26.3%
Kidney disease	2.8%
Pulmonary disease	6.8%
Cancer	7.3%

Behavior / access	%
Binge drinking	16.1%
No physical activity	21.4%
Less than 7 hrs sleep	29.9%
Fair or poor health	12.3%
Poor mental health	14.1%
Poor physical health	9.2%
No health insurance	9.6%
Visited doctor (checkup)	76.5%
Visited dentist	66.1%
Cholesterol screening	91.9%
Teeth loss	11.2%

Veterans & disability

Veterans	Count	%
Civilian veterans	511	13.2%

Disability	%
Any disability	12.9%
Under 18	2.4%
18–64 years	13.6%
65 and over	21.7%

Health insurance coverage

Type	%
Private insurance	75.2%
Public insurance	35.8%
Uninsured under 19	6.5%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	4,569	94.1%
Spanish	35	0.8%
Other Indo-European	19	0.4%
Asian & Pacific Islander	10	0.2%
Other languages	6	0.1%

Place of birth & citizenship

Origin	Count	%
Native born (US)	4,743	97.7%
Born in same state	4,727	97.4%
Born in different state	3,316	68.3%
Foreign born	16	0.3%
Naturalized citizen	112	2.3%
Not a US citizen	82	73.2%

Ancestry

Ancestry	Count	%
Arab	1,095	22.6%
Italian	646	13.3%
French	627	12.9%
Irish	10	0.2%

Ancestry	Count	%
German	8	0.2%
English	6	0.1%
Polish	5	0.1%

Technology access

Metric	% of households
Computer access	38.7%
Internet access	88.8%

Source: U.S. Census Bureau, American Community Survey 2025 estimates.

Frequently asked questions

What ZIP codes does Union Bridge, MD have?

Union Bridge, MD has one ZIP code: 21791. Each ZIP code serves a distinct delivery area within the city and surrounding region.