21010 ZIP Code — Gunpowder, MD

Harford County, Maryland

ZIP code 21010 is located in Gunpowder, Maryland, within Harford County. It covers approximately 7.25 square miles and serves a population of 216 residents. This is a po box ZIP code in the Eastern (ET) timezone, served by area code 667.

About ZIP code 21010

The housing stock consists of a significant share of large multi-unit buildings. Most homes were built in the pre-1940, giving the area an established character.

Median household income is $91,667.

The dominant occupation class is sales and office, with public administration as the leading industry.

Educational attainment is high — 78% of residents hold a bachelor's degree or higher, well above the national average of 33%.

Notable community characteristics include a notable veteran presence at 40% of civilians, above the national average of 7%.

Overall, ZIP code 21010 reflects a community defined by a highly educated population and a strong veteran community.

216

population

7.25

sq mi land

PO Box

ZIP type

Eastern (ET)

timezone

21010 ZIP code map

Cities in ZIP code 21010

Below are the cities the US Postal Service accepts for ZIP code 21010. Using any city not on this list may result in mail delivery delays.

City	Status
Gunpowder	Acceptable
Gunpowder	Acceptable
Gunpowder	Preferred

Nearby ZIP codes

21040 Edgewood (4.5 mi) 21162 White Marsh (5.7 mi) 21220 Middle River (6 mi) 21085 Joppa (6.3 mi) 21156 Upper Falls (6.9 mi) 21009 Abingdon (7.3 mi) 21017 Belcamp (8.1 mi) 21128 Perry Hall (8.3 mi) 21087 Kingsville (8.6 mi) 21005 Aberdeen Proving Ground (8.8 mi) 21221 Essex (9 mi) 21236 Nottingham (10.4 mi)

Demographics updated 05/2026

Population
Total population	216
Population density	30 / sq mi
State FIPS	24
County FIPS	025

Geography
Land area	7.25 sq mi
Water area	0.05 sq mi
Latitude	39.3673
Longitude	-76.2959
Timezone	Eastern (ET)
Area code	667

Total population by age

Gender

Race & ethnicity

Economics updated 05/2026

Household income

Income range	This ZIP	County avg	State avg
Under $50k	27.8%	25.4%	28.2%
$50k – $100k	45.1%	28.0%	28.2%
$100k – $200k	27.1%	34.2%	30.1%
Over $200k	0.0%	12.4%	13.4%

Demographics & statistics

216

Population

People per sq mi

18.0

Median age

$91,667

Median household income

$28,703

Per capita income

Median home value

$2,711

Median monthly rent

0.0%

Home ownership

0.0%

Poverty rate

0.0%

Unemployment

Housing units

78.3%

Bachelor's or higher

Age distribution

Male Female

10–14

15–19

35–44

45–54

60–64

65–74

75–84

← Male

Female →

Age summary

Group	Count	%
Under 18	109	50.5%
18 and over	107	49.5%
65 and over	11	5.1%
Median age	18.0 years

Race & ethnicity

White 84.6%

Hispanic or Latino 7.7%

Other race 7.7%

Group	Count	%
White	198	84.6%
Hispanic or Latino	18	7.7%
Other race	18	7.7%

Household income

Income range	This ZIP	County avg	State avg
Under $50k	27.8%	25.4%	28.2%
$50k – $100k	45.1%	28.0%	28.2%
$100k – $200k	27.1%	34.2%	30.1%
Over $200k	0.0%	12.4%	13.4%

$75k–$100k 70.0%

$100k–$150k 16.7%

$150k–$200k 13.3%

Range	% of households
$75k–$100k	70.0%
$100k–$150k	16.7%
$150k–$200k	13.3%
Median income	$91,667

Housing

Home values

Housing overview

Metric	Value
Median home value	$0
Median rent / month	$2,711
Owner occupied	0.0%
Renter occupied	100.0%
Vacant	49.6%
Single-family detached	52.9%
Large apartment buildings	24.4%
Mobile homes	0.0%
Median rooms	7.3
Avg household size (owned)	0.00

Year built

Era	%
2020 or later	0.0%
2010–2019	0.0%
2000–2009	0.0%
1990–1999	0.0%
1980–1989	8.4%
1970–1979	5.0%
1960–1969	19.3%
1950–1959	6.7%
1940–1949	7.6%
1939 or earlier	52.9%

Bedrooms

Size	% of units
No bedroom (studio)	22.7%
1 bedroom	10.1%
2 bedrooms	5.0%
3 bedrooms	25.2%
4 bedrooms	6.7%
5+ bedrooms	30.3%

Vehicles per household

Vehicles	% of households
No vehicle	0.0%
1 vehicle	30.0%
2 vehicles	60.0%
3 or more	10.0%

Heating fuel

Fuel type	%
Utility gas	70.0%
Electricity	30.0%

Households & families

Household type	Count	%
Married-couple family	42	70.0%
Cohabiting couple	0	0.0%
Male householder, no spouse	8	13.3%
Female householder, no spouse	10	16.7%
Households with children under 18	36	60.0%
Households with seniors (65+)	6	10.0%
Average household size	3.60

Marital status

Status	Male	Female
Never married	32.9%	56.8%
Married	67.1%	43.2%
Separated	0.0%	0.0%
Widowed	0.0%	0.0%
Divorced	0.0%	0.0%

Education

Less than 9th grade 0.0%

Some HS, no diploma 0.0%

HS graduate 0.0%

Some college, no degree 0.0%

Associate's degree 21.7%

Bachelor's degree 0.0%

Graduate / professional 78.3%

Metric	%
HS diploma or higher	100.0%
Bachelor's or higher	78.3%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	0	0.0%
Kindergarten	0	0.0%
Elementary school	0	0.0%
High school	0	0.0%
College / grad school	18	100.0%

Employment

Industry of employment

Public administration 100.0%

Occupation

Category	%
Management, business & arts	0.0%
Service	0.0%
Sales & office	100.0%
Natural resources & construction	0.0%
Production & transportation	0.0%

Employment type

Type	%
Private sector	0.0%
Government	100.0%
Self-employed	0.0%
Unpaid family workers	0.0%

Commute

Method	%
Drive alone	81.5%
Carpool	0.0%
Public transit	0.0%
Walk	0.0%
Work from home	18.5%
Other means	0.0%
Avg commute (minutes)	0.0

Poverty

All people 0.0%

Under 18 years 0.0%

18 and over 0.0%

Married-couple families 0.0%

Female-led households 0.0%

Income support

Source	% of households
Social Security	10.0%
Retirement income	10.0%
Supplemental Security	10.0%
Cash public assistance	0.0%
Food stamps / SNAP	0.0%

Health indicators

Condition	%
Obesity	37.5%
High blood pressure	30.2%
High cholesterol	27.9%
Diabetes	7.9%
Heart disease	3.5%
Stroke	1.9%
Asthma	9.8%
Arthritis	18.0%
Kidney disease	2.0%
Pulmonary disease	4.7%
Cancer	3.8%

Behavior / access	%
Smoking	19.5%
Binge drinking	17.4%
No physical activity	21.2%
Less than 7 hrs sleep	36.3%
Depression	19.3%
Fair or poor health	11.6%
Poor mental health	15.0%
Poor physical health	8.2%
No health insurance	10.4%
Visited doctor (checkup)	74.7%
Visited dentist	61.9%
Cholesterol screening	90.7%
Teeth loss	7.3%

Veterans & disability

Veterans	Count	%
Civilian veterans	36	40.4%

Disability	%
Any disability	12.1%
Under 18	0.0%
18–64 years	30.8%
65 and over	0.0%

Health insurance coverage

Type	%
Private insurance	94.4%
Public insurance	5.6%
No insurance	0.0%
Uninsured under 19	0.0%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	216	100.0%
Spanish	0	0.0%
Other Indo-European	0	0.0%
Asian & Pacific Islander	0	0.0%
Other languages	0	0.0%

Place of birth & citizenship

Origin	Count	%
Native born (US)	198	91.7%
Born in same state	198	91.7%
Born in different state	13	6.0%
Foreign born	0	0.0%
Naturalized citizen	18	8.3%
Not a US citizen	18	100.0%

Ancestry

Ancestry	Count	%
English	8	3.7%
Italian	7	3.2%

Ancestry	Count	%
French	6	2.8%

Technology access

Metric	% of households
Computer access	27.8%
Internet access	100.0%

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

Frequently asked questions about ZIP code 21010

What city is ZIP code 21010 in?

ZIP code 21010 is primarily assigned to Gunpowder, Maryland.

What county is ZIP code 21010 in?

ZIP code 21010 falls within Harford County, Maryland.

Is ZIP code 21010 family-oriented?

51% of residents in ZIP code 21010 are under 18, reflecting a younger, family-oriented community.

How educated is the population of ZIP code 21010?

78% of residents hold a bachelor's degree or higher — well above the national average of ~33%, reflecting a highly educated population.

Does ZIP code 21010 have a large veteran population?

40% of civilians in ZIP code 21010 are veterans, above the national average of ~7%.

What is the population of ZIP code 21010?

ZIP code 21010 has an estimated population of 216 residents, with a density of 30 people per square mile.

What timezone is ZIP code 21010 in?

ZIP code 21010 observes the EST timezone.