Zip code 21771: Mount Airy, Maryland

Q: What city is zip code 21771?

21771 is assigned to Mount Airy, Maryland. The city name is the one the Postal Service prefers for mail addressed to this zip code.

Q: What county is 21771 in?

21771 is mostly in Frederick County, but it extends into 3 other counties.

Q: What is the population of 21771?

About 33,031 people live in 21771, according to the Census Bureau's American Community Survey.

Q: What is the median household income in 21771?

The median household income in 21771 is $157,302.

Q: What zip codes are near 21771?

The closest zip codes to 21771 are 21792, 21770, 21765, 21774, 21797.

Residential delivery areaFrederick CountyEastern Time

Population

33,031

Median household income

$157K

U.S. $81K

Median home value

$556K

U.S. $333K

Median rent

$2,252/mo

U.S. $1,413

Median age

40.9

U.S. 38.9

Land area

90 sq mi

369 people/sq mi

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

About 21771

21771 is a small-town zip code in Mount Airy, Maryland (Frederick County), covering 90 sq mi of land. About 33,031 people live here, or 369 per square mile. The median resident is 40.9 years old, compared with 38.9 nationally.

The median household earns $157,302 a year, about 1.9× the national median of $80,734. 3.1% of residents live below the poverty line (U.S.: 12.5%). A typical home is valued at $556,200, or 3.5 years of median household income (U.S.: 4.1 years), which makes homes about as affordable as the national average for local earners. 94% of occupied homes are lived in by their owners, and renters pay a median of $2,252 a month.

49% of adults hold a bachelor's degree or higher (U.S.: 36%). Commuters average 36.1 minutes each way, and 21% of workers work from home. The most common jobs among working residents are in management; construction and repair; and office and administrative support.

How 21771 compares

Sorted from highest to lowest national percentile

Homeownership rate94%
99th
StrengthU.S. 65.2% · MD 67.6%73rd of 441 in MD
Median household income$157,302
96th
StrengthU.S. $80,734 · MD $103,67874th of 414 in MD
Average commute36.1 min
93rd
WeaknessU.S. 26.4 min · MD 31.1 min99th of 421 in MD
Government workers23.9%
93rd
U.S. 14.5% · MD 22.5%156th of 444 in MD
Median earnings per worker$77,285
92nd
StrengthU.S. $49,666 · MD $61,200108th of 443 in MD
Median gross rent$2,252
91st
U.S. $1,413 · MD $1,70545th of 338 in MD
Tech workers6.9%
90th
U.S. 3.8% · MD 6.4%131st of 444 in MD
Per capita income$60,220
85th
StrengthU.S. $44,673 · MD $52,979139th of 446 in MD
Work from home21.4%
81st
U.S. 15.1% · MD 19.3%140th of 444 in MD
Median home value$556,200
79th
U.S. $332,700 · MD $419,900101st of 421 in MD
Bachelor's degree or higher48.8%
78th
U.S. 35.7% · MD 43.4%134th of 445 in MD
Broadband access95%
76th
U.S. 91% · MD 92.4%168th of 441 in MD
Residents under 1824.2%
68th
U.S. 22% · MD 22.2%124th of 446 in MD
Median age40.9
64th
U.S. 38.9 · MD 39.4252nd of 446 in MD
Veterans6.8%
63rd
U.S. 6.2% · MD 6.8%242nd of 446 in MD
Self-employed workers9.9%
57th
U.S. 10% · MD 8.7%173rd of 444 in MD
Population33,031
55th
U.S. 334,922,499 · MD 6,206,01171st of 446 in MD
Foreign-born residents8.4%
45th
U.S. 14.1% · MD 16.6%180th of 446 in MD
Residents 65 and older15.6%
43rd
U.S. 17.2% · MD 16.7%301st of 446 in MD
Unemployment rate4.3%
39th
U.S. 5.2% · MD 4.9%191st of 444 in MD
Rent-burdened renters47.8%
39th
U.S. 51.1% · MD 51.5%221st of 404 in MD
Population density369/sq mi
29th
U.S. 95/sq mi · MD 639/sq mi237th of 446 in MD
Housing vacancy4.5%
28th
U.S. 10.1% · MD 7.7%263rd of 441 in MD
Diversity index29.8
23rd
U.S. 61.4 · MD 67.7297th of 446 in MD
Uninsured rate3.1%
13th
StrengthU.S. 8.4% · MD 6.3%259th of 444 in MD
Healthcare workers6.7%
13th
U.S. 9.7% · MD 9%292nd of 444 in MD
Poverty rate3.1%
3rd
StrengthU.S. 12.5% · MD 9.4%354th of 441 in MD
Income inequality (Gini)0.353
3rd
StrengthU.S. 0.483 · MD 0.456351st of 438 in MD

Measure	21771	Frederick	MD	U.S.	National percentile	Rank in MD
Homeownership rateStrength	94%	77%	67.6%	65.2%	99th	73rd of 441
Median household incomeStrength	$157,302	$122,002	$103,678	$80,734	96th	74th of 414
Average commuteWeakness	36.1 min	33.1 min	31.1 min	26.4 min	93rd	99th of 421
Government workers	23.9%	21.4%	22.5%	14.5%	93rd	156th of 444
Median earnings per workerStrength	$77,285	$67,763	$61,200	$49,666	92nd	108th of 443
Median gross rent	$2,252	$1,774	$1,705	$1,413	91st	45th of 338
Tech workers	6.9%	6.8%	6.4%	3.8%	90th	131st of 444
Per capita incomeStrength	$60,220	$54,982	$52,979	$44,673	85th	139th of 446
Work from home	21.4%	21.2%	19.3%	15.1%	81st	140th of 444
Median home value	$556,200	$464,600	$419,900	$332,700	79th	101st of 421
Bachelor's degree or higher	48.8%	45.8%	43.4%	35.7%	78th	134th of 445
Broadband access	95%	93.2%	92.4%	91%	76th	168th of 441
Residents under 18	24.2%	23.3%	22.2%	22%	68th	124th of 446
Median age	40.9	39	39.4	38.9	64th	252nd of 446
Veterans	6.8%	7.5%	6.8%	6.2%	63rd	242nd of 446
Self-employed workers	9.9%	8.2%	8.7%	10%	57th	173rd of 444
Population	33,031	287,048	6,206,011	334,922,499	55th	71st of 446
Foreign-born residents	8.4%	13.8%	16.6%	14.1%	45th	180th of 446
Residents 65 and older	15.6%	15.3%	16.7%	17.2%	43rd	301st of 446
Unemployment rate	4.3%	3.3%	4.9%	5.2%	39th	191st of 444
Rent-burdened renters	47.8%	48.5%	51.5%	51.1%	39th	221st of 404
Population density	369/sq mi	435/sq mi	639/sq mi	95/sq mi	29th	237th of 446
Housing vacancy	4.5%	3.9%	7.7%	10.1%	28th	263rd of 441
Diversity index	29.8	53.6	67.7	61.4	23rd	297th of 446
Uninsured rateStrength	3.1%	4.7%	6.3%	8.4%	13th	259th of 444
Healthcare workers	6.7%	7.8%	9%	9.7%	13th	292nd of 444
Poverty rateStrength	3.1%	6%	9.4%	12.5%	3rd	354th of 441
Income inequality (Gini)Strength	0.353	0.398	0.456	0.483	3rd	351st of 438

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

18%

5–17

18–24

10%

25–34

13%

35–44

13%

45–54

17%

55–64

65–74

75+

Median age

40.9

Under 18

24.2%

65 and over

15.6%

Race and ethnicity

White83%
Black4%
Hispanic8%
Asian1%
Native American0.0%
Pacific Islander0.0%
Other0.4%
Multiracial3%

Diversity index

29.8

U.S. 61.4

Foreign-born

8.4%

U.S. 14.1%

Born in state

56.5%

Language spoken at home (households)

English only

85%

Spanish

Other Indo-European

Asian / Pacific

Other

Households

Households: 11,226
Average household size: 2.9
Family households: 80.2%
Married couples: 68.9%
Living alone: 15.5%
Veterans (of adults): 6.8%
Male / female: 51% / 49%

Income and poverty

Household income distribution

<$25k

$25–50k

$50–75k

$75–100k

11%

$100–150k

18%

$150–200k

19%

$200k+

34%

Median household income

21771

$157,302

Frederick Co.

$122,002

Maryland

$103,678

United States

$80,734

Per capita income

$60,220

U.S. $44,673

Poverty rate

3.1%

U.S. 12.5%

Households earning $150K+

53.5%

U.S. 23%

Income inequality (Gini)

0.353

U.S. 0.483

Housing

Median home value

21771

$556,200

Frederick Co.

$464,600

Maryland

$419,900

United States

$332,700

Median gross rent

21771

$2,252

Frederick Co.

$1,774

Maryland

$1,705

United States

$1,413

Types of housing

Single-family

98%

2–4 units

0.6%

5–19 units

20+ units

0.3%

Mobile home

Boat, RV, van

0.1%

Housing units: 11,758
Owner-occupied: 94%
Vacant: 4.5%
Median year built: 1988
Median rooms: 8.2
Renters paying 30%+ of income: 47.8%
Renters paying 50%+ of income: 15.9%
Home value to income: 3.5× (U.S. 4.1×)

Work and commute

How people get to work

Drove alone

70%

Carpooled

Transit

0.5%

Walked

0.8%

Bicycle

Worked from home

21%

Other

0.5%

Commute time (one way)

<10 min

12%

10–19

10%

20–29

17%

30–44

22%

45–59

20%

60+

19%

Average commute

36.1 min

U.S. 26.4 min

Unemployment

4.3%

U.S. 5.2%

In labor force

72.1%

U.S. 63.5%

Jobs and careers

What employed residents do, wherever they work

Occupations

Management

14%

Construction and repair

Office and admin

Sales

Business and finance

Education

Computer and math

Healthcare

Engineering and science

Transportation and moving

Cleaning and personal care

Police and fire

Food service

Arts, media and sports

Legal and social services

Production

Farming, fishing and forestry

0.2%

Industries

Professional and technical services

14%

Public administration

12%

Construction

11%

Retail

10%

Education

10%

Health care and social assistance

Manufacturing

Finance, insurance and real estate

Admin, support and management

Other services

Restaurants and hotels

Arts and recreation

Transportation, warehousing and utilities

Information

Wholesale

Agriculture and mining

0.8%

Median earnings per worker

$77,285

U.S. $49,666

Self-employed

9.9%

U.S. 10%

Government workers

23.9%

U.S. 14.5%

Nonprofit workers

5.1%

U.S. 8.8%

Median earnings by type of work

Type of work	21771	U.S.
Management, business, science and arts	$106,830	$74,888
Service	$24,871	$26,804
Sales and office	$51,977	$40,476
Construction and maintenance	$70,826	$49,199
Production and transportation	$44,540	$39,989

Education, internet and health coverage

Highest education (adults 25+)

No diploma

High school

20%

Some college

19%

Associate's

Bachelor's

28%

Graduate

20%

High school graduate or higher: 95.9%
Bachelor's degree or higher: 48.8%
Graduate or professional degree: 20.5%
Households with broadband: 95%
Cable, fiber or DSL: 82.9%
No internet access: 3.8%
Without health insurance: 3.1%
Limited-English households: 2%

Geography

City (USPS): Mount Airy
State: Maryland
County: Frederick County
Center point: 39.3949° N, 77.1582° W
Land area: 90 sq mi
Water area: 0.2 sq mi
Time zone: Eastern Time (UTC-5, UTC-4 in summer)
Zip type: Residential delivery area

21771 spans 4 counties

Frederick County51% of land
Carroll County26% of land
Howard County18% of land
Montgomery County4% of land

Cities and towns within this zip

Green Valley (unincorporated)7% of zip
Mount Airy5% of zip

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

Zip codes near 21771

Search by radius

Zip	City	Distance	Population	IncomeMedian income	Home value
21792	Unionville, MD · PO box	5.7 mi	—	—	—
21770	Monrovia, MD	6.1 mi	8,751	$183,571	$632,500
21765	Lisbon, MD · PO box	6.1 mi	—	—	—
21774	New Market, MD	6.3 mi	17,134	$171,103	$541,000
21797	Woodbine, MD	6.5 mi	8,643	$189,241	$735,600
20872	Damascus, MD	7.1 mi	13,983	$141,050	$504,300
21762	Libertytown, MD	7.6 mi	139	—	—
21776	New Windsor, MD	9.1 mi	6,261	$133,409	$461,600
21754	Ijamsville, MD	9.5 mi	8,156	$182,188	$647,300
21723	Cooksville, MD	9.5 mi	669	$241,250	$1,005,500
21791	Union Bridge, MD	9.7 mi	5,340	$93,015	$379,800
21701	Frederick, MD	9.9 mi	43,048	$106,577	$435,000

Zip codes like 21771 elsewhere

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

Questions about 21771

What city is zip code 21771?

21771 is assigned to Mount Airy, Maryland. The city name is the one the Postal Service prefers for mail addressed to this zip code.

What county is 21771 in?

21771 is mostly in Frederick County, but it extends into 3 other counties.

What is the population of 21771?

About 33,031 people live in 21771, according to the Census Bureau's American Community Survey.

What time zone is 21771 in?

21771 is in Eastern Time.

What is the median household income in 21771?

The median household income in 21771 is $157,302.

What zip codes are near 21771?

The closest zip codes to 21771 are 21792, 21770, 21765, 21774, 21797.

Demographic figures are 2020–2024 American Community Survey 5-year estimates for ZIP Code Tabulation Area 21771, from the U.S. Census Bureau. Small areas have wide margins of error. How we build these numbers.