21661 ZIP Code — Rock Hall, MD

Kent County, Maryland

ZIP code 21661 is located in Rock Hall, Maryland, within Kent County. It covers approximately 33.04 square miles and serves a population of 2,571 residents. This is a standard ZIP code in the Eastern (ET) timezone, served by area code 410/667.

About ZIP code 21661

The housing stock consists of predominantly single-family detached homes. Most homes were built in the 1950s, giving the area an established character. Median home value is $238,400. Owner-occupancy sits near the national average at 73%.

Median household income is $77,875. 49% of households receive Social Security income, suggesting a notable retiree or disability population.

The dominant occupation class is management, business, and professional, with manufacturing as the leading industry. The average commute of 22 minutes is near the national average.

Educational attainment is near the national average, with 34% of residents holding a bachelor's degree or higher.

2,571

population

33.04

sq mi land

Standard

ZIP type

Eastern (ET)

timezone

21661 ZIP code map

Cities in ZIP code 21661

Below are the cities the US Postal Service accepts for ZIP code 21661. Using any city not on this list may result in mail delivery delays.

City	Status
Rock Hall	Preferred

Nearby ZIP codes

21620 Chestertown (10 mi) 21690 Chestertown (11.1 mi) 21619 Chester (11.1 mi) 21617 Centreville (11.2 mi) 21638 Grasonville (11.7 mi) 21658 Queenstown (12.3 mi) 21666 Stevensville (12.9 mi) 21219 Sparrows Point (13.7 mi) 21409 Annapolis (13.7 mi) 21623 Church Hill (14 mi) 21679 Wye Mills (14.9 mi) 21012 Arnold (15.1 mi)

Demographics updated 05/2026

Population
Total population	2,571
Population density	78 / sq mi
State FIPS	24
County FIPS	029

Geography
Land area	33.04 sq mi
Water area	22.03 sq mi
Latitude	39.1046
Longitude	-76.2238
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	46.1%	40.6%	28.2%
$50k – $100k	33.8%	29.0%	28.2%
$100k – $200k	10.6%	23.2%	30.1%
Over $200k	9.5%	7.2%	13.4%

Demographics & statistics

2,571

Population

People per sq mi

59.7

Median age

$77,875

Median household income

$49,219

Per capita income

$238,400

Median home value

$1,099

Median monthly rent

72.7%

Home ownership

11.5%

Poverty rate

4.1%

Unemployment

1,459

Housing units

33.8%

Bachelor's or higher

Age distribution

Male Female

Under 5

5–9

10–14

15–19

20–24

121

25–34

144

35–44

118

45–54

55–59

143

60–64

170

241

65–74

284

144

75–84

170

85+

← Male

Female →

Age summary

Group	Count	%
Under 18	338	13.1%
18 and over	2,233	86.9%
65 and over	953	37.1%
Median age	59.7 years

Race & ethnicity

White 81.5%

Hispanic or Latino 5.8%

Black or African American 5.7%

Other race 5.2%

Two or more races 1.7%

Group	Count	%
White	2,224	81.5%
Hispanic or Latino	158	5.8%
Black or African American	156	5.7%
Other race	143	5.2%
Two or more races	47	1.7%

Household income

Income range	This ZIP	County avg	State avg
Under $50k	46.1%	40.6%	28.2%
$50k – $100k	33.8%	29.0%	28.2%
$100k – $200k	10.6%	23.2%	30.1%
Over $200k	9.5%	7.2%	13.4%

Under $10k 3.6%

$10k–$15k 3.9%

$15k–$25k 8.6%

$25k–$35k 8.4%

$35k–$50k 11.3%

$50k–$75k 13.8%

$75k–$100k 22.4%

$100k–$150k 15.9%

$150k–$200k 2.1%

$200k+ 10.0%

Range	% of households
Under $10k	3.6%
$10k–$15k	3.9%
$15k–$25k	8.6%
$25k–$35k	8.4%
$35k–$50k	11.3%
$50k–$75k	13.8%
$75k–$100k	22.4%
$100k–$150k	15.9%
$150k–$200k	2.1%
$200k+	10.0%
Median income	$77,875

Housing

Home values

Under $50k 0.8%

$50k–$100k 0.8%

$100k–$150k 8.7%

$150k–$200k 30.8%

$200k–$300k 21.2%

$300k–$500k 20.5%

$500k–$1M 15.5%

$1M+ 1.7%

Housing overview

Metric	Value
Median home value	$238,400
Median rent / month	$1,099
Owner occupied	72.7%
Renter occupied	27.3%
Vacant	32.0%
Single-family detached	79.8%
Large apartment buildings	3.4%
Mobile homes	1.3%
Median rooms	6.1
Avg household size (owned)	2.02

Year built

Era	%
2020 or later	0.2%
2010–2019	7.9%
2000–2009	13.2%
1990–1999	11.9%
1980–1989	8.8%
1970–1979	11.0%
1960–1969	5.2%
1950–1959	20.8%
1940–1949	3.0%
1939 or earlier	18.1%

Bedrooms

Size	% of units
No bedroom (studio)	0.5%
1 bedroom	7.2%
2 bedrooms	33.2%
3 bedrooms	46.1%
4 bedrooms	12.0%
5+ bedrooms	1.1%

Vehicles per household

Vehicles	% of households
No vehicle	8.9%
1 vehicle	35.5%
2 vehicles	39.6%
3 or more	16.1%

Heating fuel

Fuel type	%
Utility gas	1.3%
Electricity	61.1%
Propane / LP gas	16.3%
Fuel oil	13.5%
Wood	7.8%

Households & families

Household type	Count	%
Married-couple family	448	36.8%
Cohabiting couple	148	12.2%
Male householder, no spouse	259	21.3%
Female householder, no spouse	363	29.8%
Households with children under 18	178	14.6%
Households with seniors (65+)	623	51.1%
Average household size	2.07

Marital status

Status	Male	Female
Never married	28.6%	28.6%
Married	47.3%	35.5%
Separated	0.0%	2.9%
Widowed	7.6%	13.2%
Divorced	16.5%	19.8%

Education

Less than 9th grade 1.5%

Some HS, no diploma 7.4%

HS graduate 32.2%

Some college, no degree 17.5%

Associate's degree 7.6%

Bachelor's degree 19.0%

Graduate / professional 14.8%

Metric	%
HS diploma or higher	91.1%
Bachelor's or higher	33.8%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	3	0.9%
Kindergarten	13	3.8%
Elementary school	155	45.5%
High school	117	34.3%
College / grad school	53	15.5%

Employment

Industry of employment

Manufacturing 15.4%

Education & healthcare 14.5%

Retail trade 14.1%

Professional & management 11.7%

Arts, food & hospitality 9.9%

Agriculture & mining 9.7%

Public administration 8.7%

Construction 5.7%

Finance & real estate 4.6%

Transportation & utilities 3.0%

Other services 1.4%

Wholesale trade 1.3%

Occupation

Category	%
Management, business & arts	38.1%
Service	14.0%
Sales & office	23.1%
Natural resources & construction	12.0%
Production & transportation	12.8%

Employment type

Type	%
Private sector	74.4%
Government	16.0%
Self-employed	8.7%
Unpaid family workers	0.9%

Commute

Method	%
Drive alone	76.3%
Carpool	7.3%
Public transit	0.0%
Walk	8.5%
Work from home	5.9%
Other means	2.0%
Avg commute (minutes)	22.4

Poverty

All people 11.5%

Under 18 years 19.8%

18 and over 10.2%

Married-couple families 4.0%

Female-led households 16.9%

Income support

Source	% of households
Social Security	49.3%
Retirement income	42.5%
Supplemental Security	4.9%
Cash public assistance	1.1%
Food stamps / SNAP	14.1%

Health indicators

Condition	%
Obesity	33.8%
High blood pressure	45.4%
High cholesterol	41.0%
Diabetes	15.0%
Heart disease	10.1%
Stroke	4.9%
Asthma	10.8%
Arthritis	34.9%
Kidney disease	4.3%
Pulmonary disease	10.6%
Cancer	9.5%

Behavior / access	%
Smoking	19.1%
Binge drinking	12.5%
No physical activity	27.5%
Less than 7 hrs sleep	34.2%
Depression	19.7%
Fair or poor health	18.3%
Poor mental health	13.9%
Poor physical health	12.8%
No health insurance	11.2%
Visited doctor (checkup)	79.0%
Visited dentist	59.8%
Cholesterol screening	93.1%
Teeth loss	15.8%

Veterans & disability

Veterans	Count	%
Civilian veterans	231	10.4%

Disability	%
Any disability	17.1%
Under 18	11.2%
18–64 years	10.7%
65 and over	28.3%

Health insurance coverage

Type	%
Private insurance	68.2%
Public insurance	61.1%
No insurance	1.1%
Uninsured under 19	0.0%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	2,498	97.2%
Spanish	48	1.9%
Other Indo-European	43	1.7%
Asian & Pacific Islander	5	0.2%
Other languages	0	0.0%

Place of birth & citizenship

Origin	Count	%
Native born (US)	2,492	96.9%
Born in same state	2,475	96.3%
Born in different state	1,485	57.8%
Foreign born	17	0.7%
Naturalized citizen	79	3.1%
Not a US citizen	73	92.4%

Ancestry

Ancestry	Count	%
French	493	19.2%
Italian	381	14.8%
Arab	248	9.6%

Ancestry	Count	%
German	37	1.4%
Polish	20	0.8%
English	16	0.6%

Technology access

Metric	% of households
Computer access	47.4%
Internet access	90.9%

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

Frequently asked questions about ZIP code 21661

What city is ZIP code 21661 in?

ZIP code 21661 is primarily assigned to Rock Hall, Maryland.

What county is ZIP code 21661 in?

ZIP code 21661 falls within Kent County, Maryland.

Does ZIP code 21661 have an older population?

37% of residents in ZIP code 21661 are 65 or older, above the national average of ~17%.

Does ZIP code 21661 have a large retiree population?

49% of households in ZIP code 21661 receive Social Security income, suggesting a significant retiree or disability population.

Does ZIP code 21661 have a large veteran population?

10% of civilians in ZIP code 21661 are veterans, above the national average of ~7%.

What is the population of ZIP code 21661?

ZIP code 21661 has an estimated population of 2,571 residents, with a density of 78 people per square mile.

What timezone is ZIP code 21661 in?

ZIP code 21661 observes the EST timezone.