Zip code 21057: Glen Arm, Maryland

Q: What city is zip code 21057?

21057 is assigned to Glen Arm, Maryland. The city name is the one the Postal Service prefers for mail addressed to this zip code.

Q: What county is 21057 in?

21057 is in Baltimore County, Maryland.

Q: What is the population of 21057?

About 4,386 people live in 21057, according to the Census Bureau's American Community Survey.

Q: What is the median household income in 21057?

The median household income in 21057 is $145,924.

Q: What zip codes are near 21057?

The closest zip codes to 21057 are 21092, 21082, 21051, 21234, 21286.

Residential delivery areaBaltimore CountyEastern Time

Population

4,386

Median household income

$146K

U.S. $81K

Median home value

$623K

U.S. $333K

Median rent

$1,746/mo

U.S. $1,413

Median age

41.3

U.S. 38.9

Land area

16 sq mi

276 people/sq mi

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

About 21057

21057 is a small-town zip code in Glen Arm, Maryland (Baltimore County), covering 16 sq mi of land. About 4,386 people live here, or 276 per square mile. The median resident is 41.3 years old, compared with 38.9 nationally.

The median household earns $145,924 a year, 81% above 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 $623,200, or 4.3 years of median household income (U.S.: 4.1 years), which makes homes about as affordable as the national average for local earners. 85% of occupied homes are lived in by their owners, and renters pay a median of $1,746 a month.

54% of adults hold a bachelor's degree or higher (U.S.: 36%). Commuters average 32.7 minutes each way, and 23% of workers work from home. The most common jobs among working residents are in management; construction and repair; and business and finance.

How 21057 compares

Sorted from highest to lowest national percentile

Rent-burdened renters71.1%
98th
WeaknessU.S. 51.1% · MD 51.5%52nd of 404 in MD
Median household income$145,924
94th
StrengthU.S. $80,734 · MD $103,67889th of 414 in MD
Median earnings per worker$79,598
93rd
StrengthU.S. $49,666 · MD $61,20095th of 443 in MD
Homeownership rate85.1%
89th
StrengthU.S. 65.2% · MD 67.6%177th of 441 in MD
Self-employed workers14.7%
89th
U.S. 10% · MD 8.7%80th of 444 in MD
Per capita income$61,920
86th
StrengthU.S. $44,673 · MD $52,979117th of 446 in MD
Average commute32.7 min
86th
WeaknessU.S. 26.4 min · MD 31.1 min174th of 421 in MD
Work from home23.2%
85th
U.S. 15.1% · MD 19.3%114th of 444 in MD
Bachelor's degree or higher54%
84th
StrengthU.S. 35.7% · MD 43.4%97th of 445 in MD
Median home value$623,200
83rd
U.S. $332,700 · MD $419,90063rd of 421 in MD
Residents 65 and older21.8%
82nd
U.S. 17.2% · MD 16.7%130th of 446 in MD
Tech workers4.7%
76th
U.S. 3.8% · MD 6.4%224th of 444 in MD
Residents under 1825%
74th
U.S. 22% · MD 22.2%93rd of 446 in MD
Government workers17.1%
72nd
U.S. 14.5% · MD 22.5%326th of 444 in MD
Median gross rent$1,746
70th
U.S. $1,413 · MD $1,705137th of 338 in MD
Median age41.3
67th
U.S. 38.9 · MD 39.4233rd of 446 in MD
Broadband access92.9%
57th
U.S. 91% · MD 92.4%231st of 441 in MD
Population density276/sq mi
25th
U.S. 95/sq mi · MD 639/sq mi263rd of 446 in MD
Foreign-born residents4.1%
24th
U.S. 14.1% · MD 16.6%282nd of 446 in MD
Healthcare workers7.7%
23rd
U.S. 9.7% · MD 9%242nd of 444 in MD
Diversity index29.1
22nd
U.S. 61.4 · MD 67.7304th of 446 in MD
Uninsured rate3.9%
21st
U.S. 8.4% · MD 6.3%209th of 444 in MD
Veterans3.3%
18th
U.S. 6.2% · MD 6.8%395th of 446 in MD
Housing vacancy3.6%
17th
U.S. 10.1% · MD 7.7%300th of 441 in MD
Income inequality (Gini)0.385
12th
StrengthU.S. 0.483 · MD 0.456281st of 438 in MD
Population4,386
7th
U.S. 334,922,499 · MD 6,206,011249th of 446 in MD
Unemployment rate1.7%
4th
StrengthU.S. 5.2% · MD 4.9%353rd of 444 in MD
Poverty rate3.1%
3rd
StrengthU.S. 12.5% · MD 9.4%352nd of 441 in MD

Measure	21057	Baltimore	MD	U.S.	National percentile	Rank in MD
Rent-burdened rentersWeakness	71.1%	54.2%	51.5%	51.1%	98th	52nd of 404
Median household incomeStrength	$145,924	$91,768	$103,678	$80,734	94th	89th of 414
Median earnings per workerStrength	$79,598	$57,592	$61,200	$49,666	93rd	95th of 443
Homeownership rateStrength	85.1%	66.4%	67.6%	65.2%	89th	177th of 441
Self-employed workers	14.7%	8.2%	8.7%	10%	89th	80th of 444
Per capita incomeStrength	$61,920	$49,074	$52,979	$44,673	86th	117th of 446
Average commuteWeakness	32.7 min	28 min	31.1 min	26.4 min	86th	174th of 421
Work from home	23.2%	16.5%	19.3%	15.1%	85th	114th of 444
Bachelor's degree or higherStrength	54%	42.3%	43.4%	35.7%	84th	97th of 445
Median home value	$623,200	$349,300	$419,900	$332,700	83rd	63rd of 421
Residents 65 and older	21.8%	18.1%	16.7%	17.2%	82nd	130th of 446
Tech workers	4.7%	5.2%	6.4%	3.8%	76th	224th of 444
Residents under 18	25%	21.9%	22.2%	22%	74th	93rd of 446
Government workers	17.1%	19.1%	22.5%	14.5%	72nd	326th of 444
Median gross rent	$1,746	$1,627	$1,705	$1,413	70th	137th of 338
Median age	41.3	39.7	39.4	38.9	67th	233rd of 446
Broadband access	92.9%	91.4%	92.4%	91%	57th	231st of 441
Population density	276/sq mi	1,422/sq mi	639/sq mi	95/sq mi	25th	263rd of 446
Foreign-born residents	4.1%	13.2%	16.6%	14.1%	24th	282nd of 446
Healthcare workers	7.7%	10.8%	9%	9.7%	23rd	242nd of 444
Diversity index	29.1	63.6	67.7	61.4	22nd	304th of 446
Uninsured rate	3.9%	5.4%	6.3%	8.4%	21st	209th of 444
Veterans	3.3%	5.8%	6.8%	6.2%	18th	395th of 446
Housing vacancy	3.6%	5.1%	7.7%	10.1%	17th	300th of 441
Income inequality (Gini)Strength	0.385	0.458	0.456	0.483	12th	281st of 438
Population	4,386	850,796	6,206,011	334,922,499	7th	249th of 446
Unemployment rateStrength	1.7%	4.9%	4.9%	5.2%	4th	353rd of 444
Poverty rateStrength	3.1%	9.8%	9.4%	12.5%	3rd	352nd of 441

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

20%

5–17

18–24

25–34

16%

35–44

45–54

16%

55–64

65–74

14%

75+

Median age

41.3

Under 18

25%

65 and over

21.8%

Race and ethnicity

White84%
Black5%
Hispanic7%
Asian1%
Native American0.1%
Pacific Islander0%
Other0%
Multiracial3%

Diversity index

29.1

U.S. 61.4

Foreign-born

4.1%

U.S. 14.1%

Born in state

73.7%

Language spoken at home (households)

English only

88%

Spanish

Other Indo-European

Asian / Pacific

0.1%

Other

Households

Households: 1,545
Average household size: 2.8
Family households: 76.3%
Married couples: 65.4%
Living alone: 23.1%
Veterans (of adults): 3.3%
Male / female: 49% / 51%

Income and poverty

Household income distribution

<$25k

$25–50k

$50–75k

$75–100k

$100–150k

22%

$150–200k

12%

$200k+

38%

Median household income

21057

$145,924

Baltimore Co.

$91,768

Maryland

$103,678

United States

$80,734

Per capita income

$61,920

U.S. $44,673

Poverty rate

3.1%

U.S. 12.5%

Households earning $150K+

49.1%

U.S. 23%

Income inequality (Gini)

0.385

U.S. 0.483

Housing

Median home value

21057

$623,200

Baltimore Co.

$349,300

Maryland

$419,900

United States

$332,700

Median gross rent

21057

$1,746

Baltimore Co.

$1,627

Maryland

$1,705

United States

$1,413

Types of housing

Single-family

92%

2–4 units

0.7%

5–19 units

20+ units

Mobile home

Boat, RV, van

Housing units: 1,603
Owner-occupied: 85.1%
Vacant: 3.6%
Median year built: 1970
Median rooms: 8
Renters paying 30%+ of income: 71.1%
Renters paying 50%+ of income: 35.2%
Home value to income: 4.3× (U.S. 4.1×)

Work and commute

How people get to work

Drove alone

68%

Carpooled

Transit

Walked

Bicycle

Worked from home

23%

Other

Commute time (one way)

<10 min

11%

10–19

10%

20–29

29%

30–44

21%

45–59

16%

60+

13%

Average commute

32.7 min

U.S. 26.4 min

Unemployment

1.7%

U.S. 5.2%

In labor force

63.3%

U.S. 63.5%

Jobs and careers

What employed residents do, wherever they work

Occupations

Management

19%

Construction and repair

12%

Business and finance

11%

Office and admin

10%

Sales

Healthcare

Food service

Computer and math

Engineering and science

Education

Legal and social services

Arts, media and sports

Police and fire

Cleaning and personal care

Transportation and moving

0.8%

Production

0.7%

Farming, fishing and forestry

Industries

Finance, insurance and real estate

14%

Professional and technical services

14%

Health care and social assistance

11%

Construction

10%

Education

Public administration

Restaurants and hotels

Retail

Other services

Manufacturing

Wholesale

Information

Agriculture and mining

Transportation, warehousing and utilities

Admin, support and management

0.5%

Arts and recreation

0.4%

Median earnings per worker

$79,598

U.S. $49,666

Self-employed

14.7%

U.S. 10%

Government workers

17.1%

U.S. 14.5%

Nonprofit workers

16.3%

U.S. 8.8%

Median earnings by type of work

Type of work	21057	U.S.
Management, business, science and arts	$118,306	$74,888
Service	$35,500	$26,804
Sales and office	$74,375	$40,476
Construction and maintenance	$49,700	$49,199
Production and transportation	$70,500	$39,989

Education, internet and health coverage

Highest education (adults 25+)

No diploma

High school

14%

Some college

18%

Associate's

Bachelor's

30%

Graduate

24%

High school graduate or higher: 94.2%
Bachelor's degree or higher: 54%
Graduate or professional degree: 24.3%
Households with broadband: 92.9%
Cable, fiber or DSL: 80.4%
No internet access: 2.7%
Without health insurance: 3.9%
Limited-English households: 0%

Geography

City (USPS): Glen Arm
State: Maryland
County: Baltimore County
Center point: 39.4487° N, 76.5125° W
Land area: 16 sq mi
Water area: 0.4 sq mi
Time zone: Eastern Time (UTC-5, UTC-4 in summer)
Zip type: Residential delivery area

Zip codes near 21057

Search by radius

Zip	City	Distance	Population	IncomeMedian income	Home value
21092	Long Green, MD · PO box	1.8 mi	—	—	—
21082	Hydes, MD	2.9 mi	626	$145,571	$485,500
21051	Fork, MD	3.4 mi	172	$232,721	$698,500
21234	Parkville, MD	4 mi	66,334	$83,517	$288,100
21286	Towson, MD	4.1 mi	21,853	$93,808	$430,100
21094	Lutherville Timonium, MD · PO box	4.3 mi	—	—	—
21236	Nottingham, MD	4.5 mi	39,514	$95,149	$327,200
21013	Baldwin, MD	4.5 mi	5,610	$171,354	$572,100
21128	Perry Hall, MD	4.6 mi	15,501	$128,069	$449,500
21087	Kingsville, MD	5.3 mi	5,537	$129,188	$534,300
21131	Phoenix, MD	5.6 mi	7,141	$197,619	$686,000
21284	Towson, MD · PO box	5.8 mi	—	—	—

Zip codes like 21057 elsewhere

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

Questions about 21057

What city is zip code 21057?

21057 is assigned to Glen Arm, Maryland. The city name is the one the Postal Service prefers for mail addressed to this zip code.

What county is 21057 in?

21057 is in Baltimore County, Maryland.

What is the population of 21057?

About 4,386 people live in 21057, according to the Census Bureau's American Community Survey.

What time zone is 21057 in?

21057 is in Eastern Time.

What is the median household income in 21057?

The median household income in 21057 is $145,924.

What zip codes are near 21057?

The closest zip codes to 21057 are 21092, 21082, 21051, 21234, 21286.

Demographic figures are 2020–2024 American Community Survey 5-year estimates for ZIP Code Tabulation Area 21057, from the U.S. Census Bureau. Small areas have wide margins of error. How we build these numbers.