21056 ZIP Code — Gibson Island, MD

Anne Arundel County, Maryland

ZIP code 21056 is located in Gibson Island, Maryland, within Anne Arundel County. It covers approximately 1.38 square miles and serves a population of 318 residents. This is a standard ZIP code in the Eastern (ET) timezone, served by area code 410/667.

About ZIP code 21056

The housing stock consists of predominantly single-family detached homes. Most homes were built in the 1970s, giving the area an established character. Median home value is $2,000,000.

The gap between median ($250,001) and mean household income suggests income inequality — a small number of higher earners pull the average up. 82% of households receive Social Security income, suggesting a notable retiree or disability population.

The dominant occupation class is management, business, and professional, with professional and management as the leading industry.

Educational attainment is high — 90% of residents hold a bachelor's degree or higher, well above the national average of 33%.

Overall, ZIP code 21056 reflects a community defined by a highly educated population, high homeownership, and a significant Social Security-dependent population.

318

population

1.38

sq mi land

Standard

ZIP type

Eastern (ET)

timezone

21056 ZIP code map

Cities in ZIP code 21056

Below are the cities the US Postal Service accepts for ZIP code 21056. Using any city not on this list may result in mail delivery delays.

City	Status
Gibson Island	Acceptable

Demographics updated 05/2026

Population
Total population	318
Population density	230 / sq mi
State FIPS	24
County FIPS	003

Geography
Land area	1.38 sq mi
Water area	0.25 sq mi
Latitude	39.0753
Longitude	-76.4335
Timezone	Eastern (ET)
Area code	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	8.1%	20.1%	28.2%
$50k – $100k	9.9%	27.4%	28.2%
$100k – $200k	16.3%	36.3%	30.1%
Over $200k	65.7%	16.2%	13.4%

Demographics & statistics

318

Population

230

People per sq mi

66.5

Median age

$250,001

Median household income

$194,319

Per capita income

$2,000,000

Median home value

Median monthly rent

100.0%

Home ownership

0.0%

Poverty rate

0.0%

Unemployment

277

Housing units

90.2%

Bachelor's or higher

Age distribution

Male Female

20–24

45–54

55–59

60–64

65–74

103

75–84

85+

← Male

Female →

Age summary

Group	Count	%
Under 18	0	0.0%
18 and over	318	100.0%
65 and over	229	72.0%
Median age	66.5 years

Race & ethnicity

White 100%

Group	Count	%
White	318	100%

Household income

Income range	This ZIP	County avg	State avg
Under $50k	8.1%	20.1%	28.2%
$50k – $100k	9.9%	27.4%	28.2%
$100k – $200k	16.3%	36.3%	30.1%
Over $200k	65.7%	16.2%	13.4%

$50k–$75k 10.5%

$75k–$100k 13.6%

$150k–$200k 11.7%

$200k+ 64.2%

Range	% of households
$50k–$75k	10.5%
$75k–$100k	13.6%
$150k–$200k	11.7%
$200k+	64.2%
Median income	$250,001

Housing

Home values

$500k–$1M 11.7%

$1M+ 88.3%

Housing overview

Metric	Value
Median home value	$2,000,000
Median rent / month	$0
Owner occupied	100.0%
Renter occupied	0.0%
Vacant	41.5%
Single-family detached	100.0%
Large apartment buildings	0.0%
Mobile homes	0.0%
Median rooms	7.7
Avg household size (owned)	1.96

Year built

Era	%
2020 or later	0.0%
2010–2019	0.0%
2000–2009	0.0%
1990–1999	16.6%
1980–1989	0.0%
1970–1979	23.5%
1960–1969	6.1%
1950–1959	7.9%
1940–1949	24.9%
1939 or earlier	20.9%

Bedrooms

Size	% of units
No bedroom (studio)	0.0%
1 bedroom	0.0%
2 bedrooms	6.9%
3 bedrooms	5.8%
4 bedrooms	30.7%
5+ bedrooms	56.7%

Vehicles per household

Vehicles	% of households
No vehicle	0.0%
1 vehicle	24.1%
2 vehicles	54.3%
3 or more	21.6%

Heating fuel

Fuel type	%
Electricity	13.6%
Propane / LP gas	24.7%
Fuel oil	61.7%

Households & families

Household type	Count	%
Married-couple family	123	75.9%
Cohabiting couple	0	0.0%
Male householder, no spouse	0	0.0%
Female householder, no spouse	39	24.1%
Households with children under 18	0	0.0%
Households with seniors (65+)	133	82.1%
Average household size	1.96

Marital status

Status	Male	Female
Never married	9.0%	0.0%
Married	91.0%	77.6%
Separated	0.0%	0.0%
Widowed	0.0%	22.4%
Divorced	0.0%	0.0%

Education

Less than 9th grade 0.0%

Some HS, no diploma 0.0%

HS graduate 5.9%

Some college, no degree 0.0%

Associate's degree 3.9%

Bachelor's degree 80.3%

Graduate / professional 9.8%

Metric	%
HS diploma or higher	100.0%
Bachelor's or higher	90.2%

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	0	0.0%

Employment

Industry of employment

Transportation & utilities 43.6%

Finance & real estate 20.7%

Professional & management 16.8%

Construction 12.8%

Information 6.1%

Occupation

Category	%
Management, business & arts	49.2%
Service	0.0%
Sales & office	7.3%
Natural resources & construction	0.0%
Production & transportation	43.6%

Employment type

Type	%
Private sector	77.7%
Government	0.0%
Self-employed	22.3%
Unpaid family workers	0.0%

Commute

Method	%
Drive alone	77.1%
Carpool	0.0%
Public transit	0.0%
Walk	10.1%
Work from home	12.8%
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	82.1%
Retirement income	33.3%
Supplemental Security	0.0%
Cash public assistance	0.0%
Food stamps / SNAP	0.0%

Health indicators

Condition	%
Obesity	31.0%
High blood pressure	41.8%
High cholesterol	41.9%
Diabetes	11.7%
Heart disease	8.4%
Stroke	3.4%
Asthma	8.7%
Arthritis	33.4%
Kidney disease	3.4%
Pulmonary disease	7.3%
Cancer	10.2%

Behavior / access	%
Smoking	11.8%
Binge drinking	12.7%
No physical activity	20.5%
Less than 7 hrs sleep	29.9%
Depression	18.5%
Fair or poor health	12.0%
Poor mental health	11.5%
Poor physical health	10.0%
No health insurance	7.0%
Visited doctor (checkup)	80.6%
Visited dentist	73.9%
Cholesterol screening	95.8%
Teeth loss	8.1%

Veterans & disability

Veterans	Count	%
Civilian veterans	30	9.4%

Disability	%
Any disability	6.9%
Under 18	0.0%
18–64 years	0.0%
65 and over	9.6%

Health insurance coverage

Type	%
Private insurance	94.3%
Public insurance	72.0%
No insurance	0.0%
Uninsured under 19	0.0%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	318	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)	306	96.2%
Born in same state	306	96.2%
Born in different state	100	31.4%
Foreign born	0	0.0%
Naturalized citizen	12	3.8%
Not a US citizen	12	100.0%

Ancestry

Ancestry	Count	%
French	53	16.7%
Arab	22	6.9%

Ancestry	Count	%
Italian	17	5.3%
English	12	3.8%

Technology access

Metric	% of households
Computer access	50.9%
Internet access	100.0%

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

Frequently asked questions about ZIP code 21056

What city is ZIP code 21056 in?

ZIP code 21056 is primarily assigned to Gibson Island, Maryland.

What county is ZIP code 21056 in?

ZIP code 21056 falls within Anne Arundel County, Maryland.

Does ZIP code 21056 have an older population?

72% of residents in ZIP code 21056 are 65 or older, above the national average of ~17%.

How educated is the population of ZIP code 21056?

90% of residents hold a bachelor's degree or higher — well above the national average of ~33%, reflecting a highly educated population.

Does ZIP code 21056 have a large retiree population?

82% of households in ZIP code 21056 receive Social Security income, suggesting a significant retiree or disability population.

What is the median household income in ZIP code 21056?

The median household income in ZIP code 21056 is $250,001, above the national median of ~$75,000.

What timezone is ZIP code 21056 in?

ZIP code 21056 observes the EST timezone.