21737 ZIP Code — Glenelg, MD

Howard County, Maryland

ZIP code 21737 is located in Glenelg, Maryland, within Howard County. It covers approximately 5.12 square miles and serves a population of 2,406 residents. This is a standard ZIP code in the Eastern (ET) timezone, served by area code 443/410/667.

About ZIP code 21737

The housing stock consists of predominantly single-family detached homes. Much of the housing stock is relatively new, reflecting recent development activity. Median home value is $962,200. Owner-occupancy is high at 98%, well above the national average.

The gap between median ($250,001) and mean household income suggests income inequality — a small number of higher earners pull the average up. The poverty rate of 4% is below the national average.

The dominant occupation class is management, business, and professional, with education and healthcare as the leading industry. The average commute of 29 minutes is near the national average. Remote work is prevalent — 23% of workers work from home.

Educational attainment is high — 73% of residents hold a bachelor's degree or higher, well above the national average of 33%.

Overall, ZIP code 21737 reflects a community defined by a highly educated population, high homeownership, and a high rate of remote workers.

2,406

population

5.12

sq mi land

Standard

ZIP type

Eastern (ET)

timezone

21737 ZIP code map

Cities in ZIP code 21737

Below are the cities the US Postal Service accepts for ZIP code 21737. Using any city not on this list may result in mail delivery delays.

City	Status
Glenelg	Preferred

Nearby ZIP codes

21738 Glenwood (1.5 mi) 21036 Dayton (1.8 mi) 21794 West Friendship (3.2 mi) 20833 Brookeville (3.4 mi) 21029 Clarksville (5.3 mi) 20777 Highland (6.3 mi) 21042 Ellicott City (6.4 mi) 20882 Gaithersburg (7 mi) 21797 Woodbine (7.1 mi) 20860 Sandy Spring (7.7 mi) 20861 Ashton (7.8 mi) 20832 Olney (8.1 mi)

Demographics updated 05/2026

Population
Total population	2,406
Population density	470 / sq mi
State FIPS	24
County FIPS	027

Geography
Land area	5.12 sq mi
Water area	0.05 sq mi
Latitude	39.2607
Longitude	-77.0176
Timezone	Eastern (ET)
Area code	443/410/667

Total population by age

Gender

Race & ethnicity

Economics updated 05/2026

Household income

Income range	This ZIP	County avg	State avg
Under $50k	2.5%	17.1%	28.2%
$50k – $100k	13.0%	22.9%	28.2%
$100k – $200k	29.6%	34.8%	30.1%
Over $200k	54.8%	25.2%	13.4%

Demographics & statistics

2,406

Population

470

People per sq mi

38.5

Median age

$250,001

Median household income

$95,925

Per capita income

$962,200

Median home value

Median monthly rent

98.3%

Home ownership

4.0%

Poverty rate

1.3%

Unemployment

698

Housing units

73.2%

Bachelor's or higher

Age distribution

Male Female

Under 5

5–9

10–14

111

15–19

109

20–24

115

25–34

113

141

35–44

139

165

45–54

163

131

55–59

129

60–64

65–74

75–84

85+

← Male

Female →

Age summary

Group	Count	%
Under 18	633	26.3%
18 and over	1,773	73.7%
65 and over	266	11.1%
Median age	38.5 years

Race & ethnicity

White 76.5%

Asian 13.3%

Black or African American 5.8%

Two or more races 4.4%

Group	Count	%
White	1,840	76.5%
Asian	319	13.3%
Black or African American	140	5.8%
Two or more races	107	4.4%

Household income

Income range	This ZIP	County avg	State avg
Under $50k	2.5%	17.1%	28.2%
$50k – $100k	13.0%	22.9%	28.2%
$100k – $200k	29.6%	34.8%	30.1%
Over $200k	54.8%	25.2%	13.4%

$10k–$15k 0.8%

$25k–$35k 0.7%

$35k–$50k 1.3%

$50k–$75k 3.1%

$75k–$100k 2.4%

$100k–$150k 11.1%

$150k–$200k 15.2%

$200k+ 65.4%

Range	% of households
$10k–$15k	0.8%
$25k–$35k	0.7%
$35k–$50k	1.3%
$50k–$75k	3.1%
$75k–$100k	2.4%
$100k–$150k	11.1%
$150k–$200k	15.2%
$200k+	65.4%
Median income	$250,001

Housing

Home values

$50k–$100k 2.6%

$300k–$500k 8.0%

$500k–$1M 42.7%

$1M+ 46.7%

Housing overview

Metric	Value
Median home value	$962,200
Median rent / month	$0
Owner occupied	98.3%
Renter occupied	1.7%
Vacant	0.0%
Single-family detached	99.3%
Large apartment buildings	0.0%
Mobile homes	0.0%
Median rooms	10.0
Avg household size (owned)	3.39

Year built

Era	%
2020 or later	0.0%
2010–2019	43.7%
2000–2009	5.8%
1990–1999	12.0%
1980–1989	15.1%
1970–1979	11.1%
1960–1969	9.2%
1950–1959	0.0%
1940–1949	0.8%
1939 or earlier	2.4%

Bedrooms

Size	% of units
No bedroom (studio)	0.0%
1 bedroom	0.0%
2 bedrooms	0.0%
3 bedrooms	12.1%
4 bedrooms	30.1%
5+ bedrooms	57.7%

Vehicles per household

Vehicles	% of households
No vehicle	4.1%
1 vehicle	8.0%
2 vehicles	45.6%
3 or more	42.3%

Heating fuel

Fuel type	%
Utility gas	2.8%
Electricity	51.1%
Propane / LP gas	27.2%
Fuel oil	15.8%
Wood	1.3%

Households & families

Household type	Count	%
Married-couple family	615	86.6%
Cohabiting couple	41	5.8%
Male householder, no spouse	31	4.4%
Female householder, no spouse	23	3.2%
Households with children under 18	323	45.5%
Households with seniors (65+)	179	25.2%
Average household size	3.38

Marital status

Status	Male	Female
Never married	28.2%	28.5%
Married	64.4%	61.7%
Separated	0.0%	0.0%
Widowed	3.2%	0.0%
Divorced	4.2%	9.8%

Education

Less than 9th grade 0.0%

Some HS, no diploma 0.0%

HS graduate 13.3%

Some college, no degree 9.8%

Associate's degree 3.8%

Bachelor's degree 28.3%

Graduate / professional 44.9%

Metric	%
HS diploma or higher	100.0%
Bachelor's or higher	73.2%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	134	17.9%
Kindergarten	41	5.5%
Elementary school	227	30.4%
High school	189	25.3%
College / grad school	156	20.9%

Employment

Industry of employment

Education & healthcare 25.4%

Professional & management 18.4%

Finance & real estate 13.0%

Retail trade 8.9%

Public administration 7.1%

Construction 6.7%

Manufacturing 5.9%

Agriculture & mining 5.6%

Arts, food & hospitality 5.0%

Other services 2.4%

Transportation & utilities 1.4%

Occupation

Category	%
Management, business & arts	61.9%
Service	14.9%
Sales & office	12.6%
Natural resources & construction	7.7%
Production & transportation	2.9%

Employment type

Type	%
Private sector	73.6%
Government	19.4%
Self-employed	7.1%
Unpaid family workers	0.0%

Commute

Method	%
Drive alone	69.5%
Carpool	6.7%
Public transit	0.5%
Walk	0.7%
Work from home	22.7%
Other means	0.0%
Avg commute (minutes)	29.4

Poverty

All people 4.0%

Under 18 years 0.0%

18 and over 5.5%

Married-couple families 0.0%

Female-led households 26.1%

Income support

Source	% of households
Social Security	20.0%
Retirement income	21.3%
Supplemental Security	7.3%
Cash public assistance	0.8%
Food stamps / SNAP	0.8%

Health indicators

Condition	%
Obesity	24.6%
High blood pressure	29.2%
High cholesterol	34.6%
Diabetes	7.7%
Heart disease	4.4%
Stroke	1.9%
Asthma	8.1%
Arthritis	20.1%
Kidney disease	2.1%
Pulmonary disease	3.8%
Cancer	6.4%

Behavior / access	%
Smoking	8.6%
Binge drinking	13.1%
No physical activity	14.9%
Less than 7 hrs sleep	29.8%
Depression	15.7%
Fair or poor health	7.3%
Poor mental health	10.8%
Poor physical health	6.1%
No health insurance	6.1%
Visited doctor (checkup)	75.7%
Visited dentist	77.2%
Cholesterol screening	94.6%
Teeth loss	5.4%

Veterans & disability

Veterans	Count	%
Civilian veterans	146	8.2%

Disability	%
Any disability	4.4%
Under 18	0.0%
18–64 years	1.7%
65 and over	30.1%

Health insurance coverage

Type	%
Private insurance	95.0%
Public insurance	13.9%
No insurance	0.9%
Uninsured under 19	0.0%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	2,212	91.9%
Spanish	18	0.8%
Other Indo-European	0	0.0%
Asian & Pacific Islander	0	0.0%
Other languages	18	0.8%

Place of birth & citizenship

Origin	Count	%
Native born (US)	2,104	87.4%
Born in same state	2,079	86.4%
Born in different state	1,437	59.7%
Foreign born	25	1.0%
Naturalized citizen	302	12.6%
Not a US citizen	285	94.4%

Ancestry

Ancestry	Count	%
Italian	693	28.8%
French	329	13.7%
Arab	63	2.6%

Ancestry	Count	%
Polish	42	1.7%
English	21	0.9%
German	10	0.4%

Technology access

Metric	% of households
Computer access	29.5%
Internet access	98.5%

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

Frequently asked questions about ZIP code 21737

What city is ZIP code 21737 in?

ZIP code 21737 is primarily assigned to Glenelg, Maryland.

What county is ZIP code 21737 in?

ZIP code 21737 falls within Howard County, Maryland.

How educated is the population of ZIP code 21737?

73% of residents hold a bachelor's degree or higher — well above the national average of ~33%, reflecting a highly educated population.

Is ZIP code 21737 mostly owner-occupied?

98% of occupied units in ZIP code 21737 are owner-occupied, well above the national average.

What is the median household income in ZIP code 21737?

The median household income in ZIP code 21737 is $250,001, above the national median of ~$75,000.

What is the typical home value in ZIP code 21737?

The median home value in ZIP code 21737 is $962,200.

What timezone is ZIP code 21737 in?

ZIP code 21737 observes the EST timezone.