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Maryland ZIP Codes
Howard County
Glenwood, MD
21738
21738 ZIP Code — Glenwood, MD
Howard County, Maryland
ZIP code 21738 is located in
Glenwood ,
Maryland ,
within Howard County .
It covers approximately 6.98 square miles and serves a population of
3,786 residents.
This is a standard ZIP code in the Eastern (ET) timezone,
served by area code 443/410/667 .
About ZIP code 21738
The housing stock consists of predominantly single-family detached homes. Most homes were built in the 1990s, giving the area an established character. Median home value is $837,300. Owner-occupancy is high at 97%, well above the national average.
The gap between median ($239,821) and mean household income suggests income inequality — a small number of higher earners pull the average up. The poverty rate of 3% is below the national average.
The dominant occupation class is management, business, and professional, with professional and management as the leading industry. An above-average commute of 37 minutes suggests many residents work outside the immediate area. Remote work is prevalent — 20% of workers work from home.
Educational attainment is high — 76% of residents hold a bachelor's degree or higher, well above the national average of 33%.
Overall, ZIP code 21738 reflects a community defined by a highly educated population, high homeownership, and a high rate of remote workers.
21738 ZIP code map
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Cities in ZIP code 21738
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Nearby ZIP codes
Demographics
updated 05/2026
Population
Total population
3,786
Population density
542 / sq mi
State FIPS
24
County FIPS
027
Geography
Land area
6.98 sq mi
Water area
0.04 sq mi
Latitude
39.2818
Longitude
-77.0263
Timezone
Eastern (ET)
Area code
443/410/667
Economics
updated 05/2026
Household income
Income range
This ZIP
County avg
State avg
Under $50k
6.8%
17.1%
28.2%
$50k – $100k
14.0%
22.9%
28.2%
$100k – $200k
30.1%
34.8%
30.1%
Over $200k
49.1%
25.2%
13.4%
Demographics & statistics
$239,821
Median household income
$837,300
Median home value
76.1%
Bachelor's or higher
Age distribution
Age summary
Group Count % Under 18 1,027 27.1% 18 and over 2,759 72.9% 65 and over 591 15.6% Median age 44.7 years
Race & ethnicity
Black or African American
2.1%
Group Count % White 3,278 84.9% Asian 257 6.7% Two or more races 144 3.7% Black or African American 81 2.1% Hispanic or Latino 77 2% Other race 26 0.7%
Household income
Income range
This ZIP
County avg
State avg
Under $50k
6.8%
17.1%
28.2%
$50k – $100k
14.0%
22.9%
28.2%
$100k – $200k
30.1%
34.8%
30.1%
Over $200k
49.1%
25.2%
13.4%
Range % of households $15k–$25k 0.5% $25k–$35k 1.4% $35k–$50k 1.3% $50k–$75k 0.4% $75k–$100k 5.7% $100k–$150k 18.3% $150k–$200k 7.4% $200k+ 64.9% Median income $239,821
Housing
Housing overview
Metric Value Median home value $837,300 Median rent / month $0 Owner occupied 96.7% Renter occupied 3.3% Vacant 1.3% Single-family detached 95.3% Large apartment buildings 1.9% Mobile homes 0.0% Median rooms 10.0 Avg household size (owned) 3.27
Year built
Era % 2020 or later 1.0% 2010–2019 4.3% 2000–2009 19.9% 1990–1999 24.3% 1980–1989 19.6% 1970–1979 21.1% 1960–1969 0.9% 1950–1959 1.7% 1940–1949 0.0% 1939 or earlier 7.2%
Bedrooms
Size % of units No bedroom (studio) 0.0% 1 bedroom 1.3% 2 bedrooms 0.5% 3 bedrooms 13.6% 4 bedrooms 49.8% 5+ bedrooms 34.7%
Vehicles per household
Vehicles % of households No vehicle 0.0% 1 vehicle 10.3% 2 vehicles 42.8% 3 or more 46.9%
Heating fuel
Fuel type % Utility gas 14.8% Electricity 47.6% Propane / LP gas 10.9% Fuel oil 21.1% Solar 3.4%
Households & families
Household type Count % Married-couple family 961 85.0% Cohabiting couple 6 0.5% Male householder, no spouse 148 13.1% Female householder, no spouse 16 1.4% Households with children under 18 477 42.2% Households with seniors (65+) 391 34.6% Average household size 3.35
Marital status
Status Male Female Never married 23.4% 28.4% Married 65.4% 68.3% Separated 3.2% 0.0% Widowed 3.4% 1.7% Divorced 4.6% 1.5%
Education
Some college, no degree
8.3%
Graduate / professional
39.3%
Metric % HS diploma or higher 97.7% Bachelor's or higher 76.1%
School enrollment (ages 3–17)
Type Count % Nursery / preschool 88 6.9% Kindergarten 23 1.8% Elementary school 520 40.9% High school 334 26.3% College / grad school 305 24.0%
Employment
Industry of employment
Professional & management
25.4%
Education & healthcare
21.6%
Public administration
11.4%
Arts, food & hospitality
7.5%
Finance & real estate
7.4%
Transportation & utilities
1.7%
Agriculture & mining
1.5%
Occupation
Category % Management, business & arts 67.2% Service 12.1% Sales & office 13.8% Natural resources & construction 2.1% Production & transportation 4.9%
Employment type
Type % Private sector 72.9% Government 18.6% Self-employed 7.5% Unpaid family workers 0.9%
Commute
Method % Drive alone 69.2% Carpool 10.0% Public transit 0.0% Walk 0.0% Work from home 20.3% Other means 0.5% Avg commute (minutes) 36.5
Poverty
Married-couple families
1.7%
Female-led households
0.0%
Income support
Source % of households Social Security 24.2% Retirement income 34.7% Supplemental Security 3.1% Cash public assistance 0.0% Food stamps / SNAP 0.0%
Health indicators
Condition % Obesity 27.2% High blood pressure 32.0% High cholesterol 35.7% Diabetes 8.5% Heart disease 4.9% Stroke 2.2% Asthma 8.7% Arthritis 22.6% Kidney disease 2.3% Pulmonary disease 4.6% Cancer 7.0%
Behavior / access % Smoking 10.0% Binge drinking 13.3% No physical activity 15.9% Less than 7 hrs sleep 30.2% Depression 16.8% Fair or poor health 8.5% Poor mental health 11.3% Poor physical health 7.0% No health insurance 6.5% Visited doctor (checkup) 76.3% Visited dentist 76.0% Cholesterol screening 94.9% Teeth loss 6.0%
Veterans & disability
Veterans Count % Civilian veterans 147 5.3%
Disability % Any disability 5.6% Under 18 0.0% 18–64 years 4.2% 65 and over 20.6%
Health insurance coverage
Type % Private insurance 95.0% Public insurance 17.6% No insurance 1.4% Uninsured under 19 2.0%
Language & origin
Language spoken at home (age 5+)
Language Count % English only 3,612 95.4% Spanish 160 4.4% Other Indo-European 39 1.1% Asian & Pacific Islander 20 0.6% Other languages 101 2.8%
Place of birth & citizenship
Origin Count % Native born (US) 3,451 91.2% Born in same state 3,389 89.5% Born in different state 1,731 45.7% Foreign born 62 1.6% Naturalized citizen 335 8.8% Not a US citizen 312 93.1%
Ancestry
Ancestry Count % French 820 21.7% Italian 349 9.2% Arab 149 3.9% Polish 34 0.9%
Ancestry Count % Norwegian 27 0.7% Irish 22 0.6% English 17 0.4% Dutch 14 0.4%
Technology access
Metric % of households Computer access 29.9% Internet access 100.0%
Source: U.S. Census Bureau, American Community Survey 2025 estimates.
Frequently asked questions about ZIP code 21738
What city is ZIP code 21738 in?
ZIP code 21738 is primarily assigned to Glenwood, Maryland.
What county is ZIP code 21738 in?
ZIP code 21738 falls within Howard County, Maryland.
How educated is the population of ZIP code 21738?
76% of residents hold a bachelor's degree or higher — well above the national average of ~33%, reflecting a highly educated population.
Is ZIP code 21738 mostly owner-occupied?
97% of occupied units in ZIP code 21738 are owner-occupied, well above the national average.
What is the median household income in ZIP code 21738?
The median household income in ZIP code 21738 is $239,821, above the national median of ~$75,000.
What is the typical home value in ZIP code 21738?
The median home value in ZIP code 21738 is $837,300.
What timezone is ZIP code 21738 in?
ZIP code 21738 observes the EST timezone.
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