Glen Arm ZIP Codes — Baltimore County, MD

There is one unique ZIP code in Glen Arm, Maryland and it is 21057. Area code: 410/443.

ZIP codes

15.89

sq mi land

0.44

sq mi water

410/443

area code

Glen Arm, MD ZIP code map

About Glen Arm, MD

Glen Arm, Maryland, is a charming community located in Baltimore County. This small city is well-known for its picturesque landscapes and close-knit neighborhoods. It offers a peaceful suburban environment while maintaining proximity to urban amenities.

Location & geography

Glen Arm is situated in northern Baltimore County, making it part of the greater Baltimore metropolitan area. Nearby cities include Towson, approximately 12 miles to the southwest, and Aberdeen, located about 16 miles to the northeast. The city covers a total land area of 15.89 square miles, with an additional 0.44 square miles designated as water.

Community & economy

The character of Glen Arm is marked by its rural charm and community-oriented lifestyle. The local economy is primarily driven by small businesses, agriculture, and some suburban residential development. Residents enjoy a tranquil daily life, often participating in community events and outdoor recreational activities.

Transportation

Glen Arm is accessible via several main roads, including Glen Arm Road, which connects to the wider road network. The nearest major highway is Maryland Route 1, providing access to Baltimore and beyond. Baltimore/Washington International Thurgood Marshall Airport is approximately 30 miles to the south and serves as the nearest major airport.

History

Glen Arm was founded in the 19th century, originally developing as a rural community characterized by agriculture. Over the years, it has evolved, but retains its historical charm and connection to its agricultural roots. Notable events in its history include the establishment of various local farms and small businesses that have contributed to the community's growth.

Did you know?

A surprising fact about Glen Arm is its beautiful landscapes, which include rolling hills and lush greenery that make it a hidden gem in Maryland. Additionally, the area is known for its numerous equestrian facilities and horse farms, making it a unique location for horse enthusiasts.

ZIP codes for Glen Arm, MD (1)

ZIP code	City	County	Map
21057	Glen Arm	Baltimore	View map

Demographics & statistics

4,530

Population

45.5

Median age

$163,462

Median household income

$62,251

Per capita income

$576,100

Median home value

$1,620

Median monthly rent

86.0%

Home ownership

1.4%

Poverty rate

1.9%

Unemployment

1,497

Housing units

54.7%

Bachelor's or higher

Age distribution

Male Female

135

Under 5

129

184

5–9

175

150

10–14

144

15–19

137

20–24

25–34

348

35–44

332

298

45–54

285

220

55–59

210

170

60–64

163

239

65–74

228

197

75–84

188

85+

← Male

Female →

Age summary

Group	Count	%
Under 18	1,110	24.5%
18 and over	3,420	75.5%
65 and over	961	21.2%
Median age	45.5 years

Race & ethnicity

White 85.9%

Black or African American 4.5%

Hispanic or Latino 3%

Two or more races 3%

Asian 2.1%

Other race 1.2%

American Indian / Alaska Native 0.2%

Group	Count	%
White	4,011	85.9%
Black or African American	212	4.5%
Hispanic or Latino	142	3%
Two or more races	141	3%
Asian	99	2.1%
Other race	58	1.2%
American Indian / Alaska Native	9	0.2%

Household income

Under $10k 2.8%

$10k–$15k 2.7%

$15k–$25k 3.7%

$25k–$35k 3.2%

$35k–$50k 7.2%

$50k–$75k 2.2%

$75k–$100k 4.7%

$100k–$150k 20.7%

$150k–$200k 17.5%

$200k+ 35.3%

Range	% of households
Under $10k	2.8%
$10k–$15k	2.7%
$15k–$25k	3.7%
$25k–$35k	3.2%
$35k–$50k	7.2%
$50k–$75k	2.2%
$75k–$100k	4.7%
$100k–$150k	20.7%
$150k–$200k	17.5%
$200k+	35.3%
Median income	$163,462

Housing

Home values

Under $50k 1.4%

$150k–$200k 2.2%

$200k–$300k 2.3%

$300k–$500k 27.2%

$500k–$1M 63.3%

$1M+ 3.6%

Housing overview

Metric	Value
Median home value	$576,100
Median rent / month	$1,620
Owner occupied	86.0%
Renter occupied	14.0%
Vacant	6.8%
Single-family detached	86.5%
Large apartment buildings	6.2%
Mobile homes	0.0%
Median rooms	8.1
Avg household size (owned)	3.04

Year built

Era	%
2020 or later	0.0%
2010–2019	7.2%
2000–2009	1.6%
1990–1999	7.3%
1980–1989	17.3%
1970–1979	19.3%
1960–1969	11.7%
1950–1959	13.3%
1940–1949	2.3%
1939 or earlier	19.9%

Bedrooms

Size	% of units
No bedroom (studio)	2.6%
1 bedroom	5.6%
2 bedrooms	6.9%
3 bedrooms	26.3%
4 bedrooms	44.2%
5+ bedrooms	14.5%

Vehicles per household

Vehicles	% of households
No vehicle	7.0%
1 vehicle	11.2%
2 vehicles	49.8%
3 or more	32.0%

Heating fuel

Fuel type	%
Utility gas	14.1%
Electricity	31.7%
Propane / LP gas	5.2%
Fuel oil	38.2%
Wood	5.5%
No fuel used	2.7%

Households & families

Household type	Count	%
Married-couple family	1,207	75.2%
Cohabiting couple	14	0.9%
Male householder, no spouse	145	9.0%
Female householder, no spouse	238	14.8%
Households with children under 18	596	37.2%
Households with seniors (65+)	644	40.1%
Average household size	2.80

Marital status

Status	Male	Female
Never married	21.4%	14.7%
Married	72.0%	70.3%
Separated	1.4%	0.4%
Widowed	1.9%	8.2%
Divorced	3.3%	6.4%

Education

Less than 9th grade 1.9%

Some HS, no diploma 5.1%

HS graduate 12.4%

Some college, no degree 14.9%

Associate's degree 10.9%

Bachelor's degree 30.0%

Graduate / professional 24.7%

Metric	%
HS diploma or higher	93.0%
Bachelor's or higher	54.7%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	159	13.1%
Kindergarten	77	6.3%
Elementary school	365	30.1%
High school	352	29.0%
College / grad school	261	21.5%

Employment

Industry of employment

Education & healthcare 23.2%

Finance & real estate 17.7%

Professional & management 13.4%

Construction 8.7%

Public administration 8.5%

Other services 5.0%

Retail trade 4.7%

Transportation & utilities 4.1%

Manufacturing 3.9%

Information 3.4%

Arts, food & hospitality 3.1%

Agriculture & mining 2.7%

Wholesale trade 1.6%

Occupation

Category	%
Management, business & arts	59.1%
Service	9.8%
Sales & office	17.6%
Natural resources & construction	11.6%
Production & transportation	1.9%

Employment type

Type	%
Private sector	77.5%
Government	16.4%
Self-employed	5.8%
Unpaid family workers	0.3%

Commute

Method	%
Drive alone	79.4%
Carpool	3.9%
Public transit	0.4%
Walk	0.3%
Other means	0.0%
Avg commute (minutes)	32.0

Poverty

All people 1.4%

Under 18 years 0.0%

18 and over 1.9%

Married-couple families 0.0%

Female-led households 0.0%

Income support

Source	% of households
Social Security	39.5%
Retirement income	28.9%
Supplemental Security	1.2%
Cash public assistance	0.0%
Food stamps / SNAP	1.5%

Health indicators

Condition	%
High blood pressure	36.0%
High cholesterol	37.9%
Heart disease	6.8%
Stroke	2.9%
Asthma	8.7%
Arthritis	28.9%
Kidney disease	3.0%
Pulmonary disease	5.4%
Cancer	9.9%

Behavior / access	%
Binge drinking	13.7%
No physical activity	18.2%
Less than 7 hrs sleep	27.2%
Fair or poor health	10.1%
Poor mental health	11.6%
Poor physical health	7.6%
No health insurance	6.6%
Visited doctor (checkup)	79.0%
Visited dentist	74.5%
Cholesterol screening	95.3%
Teeth loss	6.9%

Veterans & disability

Veterans	Count	%
Civilian veterans	114	3.3%

Disability	%
Any disability	10.7%
Under 18	7.2%
18–64 years	5.3%
65 and over	28.5%

Health insurance coverage

Type	%
Private insurance	88.8%
Public insurance	22.5%
Uninsured under 19	6.1%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	4,266	94.2%
Spanish	83	1.9%
Other Indo-European	0	0.0%
Asian & Pacific Islander	62	1.5%
Other languages	1	0.0%

Place of birth & citizenship

Origin	Count	%
Native born (US)	4,261	94.1%
Born in same state	4,166	92.0%
Born in different state	3,059	67.5%
Foreign born	95	2.1%
Naturalized citizen	269	5.9%
Not a US citizen	262	97.4%

Ancestry

Ancestry	Count	%
Italian	618	13.6%
French	577	12.7%
Arab	343	7.6%

Ancestry	Count	%
German	92	2%
Polish	41	0.9%
Norwegian	11	0.2%

Technology access

Metric	% of households
Computer access	35.4%
Internet access	93.5%

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

Frequently asked questions

What ZIP codes does Glen Arm, MD have?

Glen Arm, MD has one ZIP code: 21057. Each ZIP code serves a distinct delivery area within the city and surrounding region.