Zip code 21791: Union Bridge, Maryland

Q: What city is zip code 21791?

21791 is assigned to Union Bridge, Maryland. The city name is the one the Postal Service prefers for mail addressed to this zip code.

Q: What county is 21791 in?

21791 is mostly in Frederick County, but it extends into 1 other county.

Q: What is the population of 21791?

About 5,340 people live in 21791, according to the Census Bureau's American Community Survey.

Q: What is the median household income in 21791?

The median household income in 21791 is $93,015.

Q: What zip codes are near 21791?

The closest zip codes to 21791 are 21792, 21762, 21776, 21757, 21798.

Residential delivery areaFrederick CountyEastern Time

Population

5,340

Median household income

$93K

U.S. $81K

Median home value

$380K

U.S. $333K

Median rent

$1,457/mo

U.S. $1,413

Median age

37.7

U.S. 38.9

Land area

46 sq mi

116 people/sq mi

Boundary is the Census Bureau's ZIP Code Tabulation Area, which closely tracks the postal delivery area.

About 21791

21791 is a small-town zip code in Union Bridge, Maryland (Frederick County), covering 46 sq mi of land. About 5,340 people live here, or 116 per square mile. The median resident is 37.7 years old, compared with 38.9 nationally.

The median household earns $93,015 a year, 15% above the national median of $80,734. 5.1% of residents live below the poverty line (U.S.: 12.5%). A typical home is valued at $379,800, or 4.1 years of median household income (U.S.: 4.1 years), which makes homes about as affordable as the national average for local earners. 82% of occupied homes are lived in by their owners, and renters pay a median of $1,457 a month.

27% of adults hold a bachelor's degree or higher (U.S.: 36%). Commuters average 37.3 minutes each way, and 11% of workers work from home. The most common jobs among working residents are in management; construction and repair; and office and administrative support.

How 21791 compares

Sorted from highest to lowest national percentile

Average commute37.3 min
95th
WeaknessU.S. 26.4 min · MD 31.1 min81st of 421 in MD
Veterans12.6%
95th
U.S. 6.2% · MD 6.8%53rd of 446 in MD
Government workers20.1%
85th
U.S. 14.5% · MD 22.5%253rd of 444 in MD
Homeownership rate81.7%
82nd
StrengthU.S. 65.2% · MD 67.6%224th of 441 in MD
Uninsured rate10.6%
74th
U.S. 8.4% · MD 6.3%38th of 444 in MD
Residents under 1824.5%
71st
U.S. 22% · MD 22.2%109th of 446 in MD
Residents 65 and older19.2%
69th
U.S. 17.2% · MD 16.7%178th of 446 in MD
Median household income$93,015
65th
U.S. $80,734 · MD $103,678244th of 414 in MD
Median home value$379,800
59th
U.S. $332,700 · MD $419,900253rd of 421 in MD
Median earnings per worker$50,159
56th
U.S. $49,666 · MD $61,200324th of 443 in MD
Median gross rent$1,457
54th
U.S. $1,413 · MD $1,705209th of 338 in MD
Rent-burdened renters51.7%
54th
U.S. 51.1% · MD 51.5%177th of 404 in MD
Self-employed workers9.6%
54th
U.S. 10% · MD 8.7%188th of 444 in MD
Per capita income$41,286
53rd
U.S. $44,673 · MD $52,979316th of 446 in MD
Median age37.7
40th
U.S. 38.9 · MD 39.4332nd of 446 in MD
Work from home11%
40th
U.S. 15.1% · MD 19.3%323rd of 444 in MD
Bachelor's degree or higher26.7%
38th
U.S. 35.7% · MD 43.4%313th of 445 in MD
Housing vacancy4.4%
27th
U.S. 10.1% · MD 7.7%268th of 441 in MD
Population density116/sq mi
15th
U.S. 95/sq mi · MD 639/sq mi339th of 446 in MD
Broadband access85.9%
15th
WeaknessU.S. 91% · MD 92.4%362nd of 441 in MD
Tech workers1.1%
15th
U.S. 3.8% · MD 6.4%351st of 444 in MD
Foreign-born residents2.2%
13th
U.S. 14.1% · MD 16.6%350th of 446 in MD
Poverty rate5.1%
12th
StrengthU.S. 12.5% · MD 9.4%275th of 441 in MD
Population5,340
9th
U.S. 334,922,499 · MD 6,206,011234th of 446 in MD
Diversity index12.6
6th
U.S. 61.4 · MD 67.7389th of 446 in MD
Unemployment rate2%
5th
StrengthU.S. 5.2% · MD 4.9%340th of 444 in MD
Income inequality (Gini)0.357
4th
StrengthU.S. 0.483 · MD 0.456347th of 438 in MD
Healthcare workers3.5%
1st
U.S. 9.7% · MD 9%392nd of 444 in MD

Measure	21791	Frederick	MD	U.S.	National percentile	Rank in MD
Average commuteWeakness	37.3 min	33.1 min	31.1 min	26.4 min	95th	81st of 421
Veterans	12.6%	7.5%	6.8%	6.2%	95th	53rd of 446
Government workers	20.1%	21.4%	22.5%	14.5%	85th	253rd of 444
Homeownership rateStrength	81.7%	77%	67.6%	65.2%	82nd	224th of 441
Uninsured rate	10.6%	4.7%	6.3%	8.4%	74th	38th of 444
Residents under 18	24.5%	23.3%	22.2%	22%	71st	109th of 446
Residents 65 and older	19.2%	15.3%	16.7%	17.2%	69th	178th of 446
Median household income	$93,015	$122,002	$103,678	$80,734	65th	244th of 414
Median home value	$379,800	$464,600	$419,900	$332,700	59th	253rd of 421
Median earnings per worker	$50,159	$67,763	$61,200	$49,666	56th	324th of 443
Median gross rent	$1,457	$1,774	$1,705	$1,413	54th	209th of 338
Rent-burdened renters	51.7%	48.5%	51.5%	51.1%	54th	177th of 404
Self-employed workers	9.6%	8.2%	8.7%	10%	54th	188th of 444
Per capita income	$41,286	$54,982	$52,979	$44,673	53rd	316th of 446
Median age	37.7	39	39.4	38.9	40th	332nd of 446
Work from home	11%	21.2%	19.3%	15.1%	40th	323rd of 444
Bachelor's degree or higher	26.7%	45.8%	43.4%	35.7%	38th	313th of 445
Housing vacancy	4.4%	3.9%	7.7%	10.1%	27th	268th of 441
Population density	116/sq mi	435/sq mi	639/sq mi	95/sq mi	15th	339th of 446
Broadband accessWeakness	85.9%	93.2%	92.4%	91%	15th	362nd of 441
Tech workers	1.1%	6.8%	6.4%	3.8%	15th	351st of 444
Foreign-born residents	2.2%	13.8%	16.6%	14.1%	13th	350th of 446
Poverty rateStrength	5.1%	6%	9.4%	12.5%	12th	275th of 441
Population	5,340	287,048	6,206,011	334,922,499	9th	234th of 446
Diversity index	12.6	53.6	67.7	61.4	6th	389th of 446
Unemployment rateStrength	2%	3.3%	4.9%	5.2%	5th	340th of 444
Income inequality (Gini)Strength	0.357	0.398	0.456	0.483	4th	347th of 438
Healthcare workers	3.5%	7.8%	9%	9.7%	1st	392nd of 444

The percentile is the share of Americans who live in a zip code with a lower value, so the 50th percentile is typical. Rank 1 is the highest value in the state. Both include zip codes with at least 100 residents. Strengths and weaknesses mark measures in the best or worst fifth nationally, where higher or lower is clearly better (income, poverty, education, commute, broadband, insurance and similar). Measures like age or density are left unmarked.

People

Age

Under 5

19%

5–17

18–24

14%

25–34

13%

35–44

45–54

13%

55–64

65–74

10%

75+

Median age

37.7

Under 18

24.5%

65 and over

19.2%

Race and ethnicity

White93%
Black2%
Hispanic1%
Asian3%
Native American0.0%
Pacific Islander0%
Other0%
Multiracial1.0%

Diversity index

12.6

U.S. 61.4

Foreign-born

2.2%

U.S. 14.1%

Born in state

65.8%

Language spoken at home (households)

English only

96%

Spanish

0.7%

Other Indo-European

Asian / Pacific

0.9%

Other

Households

Households: 1,968
Average household size: 2.7
Family households: 71.4%
Married couples: 59.1%
Living alone: 24.2%
Veterans (of adults): 12.6%
Male / female: 51% / 49%

Income and poverty

Household income distribution

<$25k

$25–50k

10%

$50–75k

19%

$75–100k

19%

$100–150k

21%

$150–200k

15%

$200k+

Median household income

21791

$93,015

Frederick Co.

$122,002

Maryland

$103,678

United States

$80,734

Per capita income

$41,286

U.S. $44,673

Poverty rate

5.1%

U.S. 12.5%

Households earning $150K+

23.9%

U.S. 23%

Income inequality (Gini)

0.357

U.S. 0.483

Housing

Median home value

21791

$379,800

Frederick Co.

$464,600

Maryland

$419,900

United States

$332,700

Median gross rent

21791

$1,457

Frederick Co.

$1,774

Maryland

$1,705

United States

$1,413

Types of housing

Single-family

94%

2–4 units

5–19 units

20+ units

Mobile home

0.4%

Boat, RV, van

Housing units: 2,059
Owner-occupied: 81.7%
Vacant: 4.4%
Median year built: 1964
Median rooms: 6.9
Renters paying 30%+ of income: 51.7%
Renters paying 50%+ of income: 27%
Home value to income: 4.1× (U.S. 4.1×)

Work and commute

How people get to work

Drove alone

79%

Carpooled

Transit

0.4%

Walked

0.9%

Bicycle

Worked from home

11%

Other

Commute time (one way)

<10 min

10–19

15%

20–29

22%

30–44

18%

45–59

21%

60+

19%

Average commute

37.3 min

U.S. 26.4 min

Unemployment

U.S. 5.2%

In labor force

63.7%

U.S. 63.5%

Jobs and careers

What employed residents do, wherever they work

Occupations

Management

13%

Construction and repair

12%

Office and admin

12%

Cleaning and personal care

Sales

Police and fire

Food service

Business and finance

Production

Education

Engineering and science

Transportation and moving

Healthcare

Farming, fishing and forestry

Arts, media and sports

Computer and math

Legal and social services

0.4%

Industries

Retail

12%

Construction

11%

Public administration

10%

Admin, support and management

Agriculture and mining

Restaurants and hotels

Transportation, warehousing and utilities

Professional and technical services

Health care and social assistance

Education

Manufacturing

Other services

Finance, insurance and real estate

Arts and recreation

Wholesale

0.5%

Information

0.4%

Median earnings per worker

$50,159

U.S. $49,666

Self-employed

9.6%

U.S. 10%

Government workers

20.1%

U.S. 14.5%

Nonprofit workers

1.8%

U.S. 8.8%

Median earnings by type of work

Type of work	21791	U.S.
Management, business, science and arts	$77,619	$74,888
Service	$32,000	$26,804
Sales and office	$39,792	$40,476
Construction and maintenance	$61,222	$49,199
Production and transportation	$45,893	$39,989

Education, internet and health coverage

Highest education (adults 25+)

No diploma

High school

40%

Some college

20%

Associate's

Bachelor's

16%

Graduate

11%

High school graduate or higher: 92.3%
Bachelor's degree or higher: 26.7%
Graduate or professional degree: 10.8%
Households with broadband: 85.9%
Cable, fiber or DSL: 64.6%
No internet access: 11.7%
Without health insurance: 10.6%
Limited-English households: 0.2%

Geography

City (USPS): Union Bridge
State: Maryland
County: Frederick County
Center point: 39.5331° N, 77.1886° W
Land area: 46 sq mi
Water area: 0.1 sq mi
Time zone: Eastern Time (UTC-5, UTC-4 in summer)
Zip type: Residential delivery area

21791 spans 2 counties

Frederick County61% of land
Carroll County39% of land

Cities and towns within this zip

Union Bridge2% of zip
Libertytown (unincorporated)2% of zip

Census places overlapping the zip's area. Mail may use a different city name than the municipality.

Zip codes near 21791

Search by radius

Zip	City	Distance	Population	IncomeMedian income	Home value
21792	Unionville, MD · PO box	4 mi	—	—	—
21762	Libertytown, MD	4.8 mi	139	—	—
21776	New Windsor, MD	4.8 mi	6,261	$133,409	$461,600
21757	Keymar, MD	5.6 mi	2,671	$100,500	$466,100
21798	Woodsboro, MD	5.7 mi	2,928	$116,607	$498,400
21759	Ladiesburg, MD · PO box	6 mi	—	—	—
21775	New Midway, MD · PO box	6.1 mi	—	—	—
21793	Walkersville, MD	8.8 mi	10,719	$121,971	$459,400
21778	Rocky Ridge, MD	9.4 mi	745	$76,458	$382,100
21774	New Market, MD	9.6 mi	17,134	$171,103	$541,000
21771	Mount Airy, MD	9.7 mi	33,031	$157,302	$556,200
21701	Frederick, MD	9.9 mi	43,048	$106,577	$435,000

Zip codes like 21791 elsewhere

Matched on income, home values, age, density, education, housing and commuting

Questions about 21791

What city is zip code 21791?

21791 is assigned to Union Bridge, Maryland. The city name is the one the Postal Service prefers for mail addressed to this zip code.

What county is 21791 in?

21791 is mostly in Frederick County, but it extends into 1 other county.

What is the population of 21791?

About 5,340 people live in 21791, according to the Census Bureau's American Community Survey.

What time zone is 21791 in?

21791 is in Eastern Time.

What is the median household income in 21791?

The median household income in 21791 is $93,015.

What zip codes are near 21791?

The closest zip codes to 21791 are 21792, 21762, 21776, 21757, 21798.

Demographic figures are 2020–2024 American Community Survey 5-year estimates for ZIP Code Tabulation Area 21791, from the U.S. Census Bureau. Small areas have wide margins of error. How we build these numbers.