21639 ZIP Code — Greensboro, MD

Caroline County, Maryland

ZIP code 21639 is located in Greensboro, Maryland, within Caroline County. It covers approximately 33.09 square miles and serves a population of 4,734 residents. This is a standard ZIP code in the Eastern (ET) timezone, served by area code 410/667.

About ZIP code 21639

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 $245,200. Owner-occupancy sits near the national average at 70%.

Median household income is $56,173. Poverty affects 18% of residents, above the national average. SNAP benefit usage at 19% of households reflects economic stress in the area. 35% of households receive Social Security income, suggesting a notable retiree or disability population.

The dominant occupation class is management, business, and professional, with education and healthcare as the leading industry. The average commute of 34 minutes is near the national average.

College attainment at 11% is below the national average, consistent with a trades and production-oriented local economy.

Health indicators show elevated rates of smoking (20%) compared to national benchmarks.

Overall, ZIP code 21639 reflects a community defined by a trades-oriented workforce, economic challenges above the national average, a significant Social Security-dependent population, and elevated reliance on food assistance.

4,734

population

33.09

sq mi land

Standard

ZIP type

Eastern (ET)

timezone

21639 ZIP code map

Cities in ZIP code 21639

Below are the cities the US Postal Service accepts for ZIP code 21639. Using any city not on this list may result in mail delivery delays.

City	Status
Greensboro	Preferred

Nearby ZIP codes

21636 Goldsboro (3.8 mi) 21660 Ridgely (4.7 mi) 21640 Henderson (7.3 mi) 21629 Denton (8.4 mi) 21657 Queen Anne (10 mi) 19943 Felton (11 mi) 19952 Harrington (11 mi) 21644 Ingleside (11.8 mi) 21649 Marydel (11.9 mi) 21607 Barclay (11.9 mi) 21625 Cordova (12.3 mi) 19934 Camden Wyoming (13.4 mi)

Demographics updated 05/2026

Population
Total population	4,734
Population density	143 / sq mi
State FIPS	24
County FIPS	011

Geography
Land area	33.09 sq mi
Water area	0.32 sq mi
Latitude	38.9642
Longitude	-75.8005
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	44.0%	40.1%	28.2%
$50k – $100k	31.8%	34.3%	28.2%
$100k – $200k	23.9%	21.3%	30.1%
Over $200k	0.3%	4.3%	13.4%

Demographics & statistics

4,734

Population

143

People per sq mi

35.4

Median age

$56,173

Median household income

$30,701

Per capita income

$245,200

Median home value

$1,154

Median monthly rent

70.4%

Home ownership

17.8%

Poverty rate

3.0%

Unemployment

1,392

Housing units

11.1%

Bachelor's or higher

Age distribution

Male Female

200

Under 5

189

224

5–9

211

167

10–14

157

137

15–19

130

152

20–24

144

314

25–34

295

325

35–44

306

286

45–54

269

150

55–59

141

161

60–64

151

180

65–74

170

108

75–84

102

85+

← Male

Female →

Age summary

Group	Count	%
Under 18	1,317	27.8%
18 and over	3,417	72.2%
65 and over	625	13.2%
Median age	35.4 years

Race & ethnicity

White 70.5%

Two or more races 10%

Hispanic or Latino 7.2%

Black or African American 6.8%

American Indian / Alaska Native 5%

Other race 0.4%

Asian 0.1%

Group	Count	%
White	3,597	70.5%
Two or more races	511	10%
Hispanic or Latino	367	7.2%
Black or African American	349	6.8%
American Indian / Alaska Native	253	5%
Other race	19	0.4%
Asian	5	0.1%

Household income

Income range	This ZIP	County avg	State avg
Under $50k	44.0%	40.1%	28.2%
$50k – $100k	31.8%	34.3%	28.2%
$100k – $200k	23.9%	21.3%	30.1%
Over $200k	0.3%	4.3%	13.4%

Under $10k 2.3%

$10k–$15k 2.3%

$15k–$25k 11.6%

$25k–$35k 12.6%

$35k–$50k 13.3%

$50k–$75k 15.7%

$75k–$100k 9.2%

$100k–$150k 23.3%

$150k–$200k 5.5%

$200k+ 4.1%

Range	% of households
Under $10k	2.3%
$10k–$15k	2.3%
$15k–$25k	11.6%
$25k–$35k	12.6%
$35k–$50k	13.3%
$50k–$75k	15.7%
$75k–$100k	9.2%
$100k–$150k	23.3%
$150k–$200k	5.5%
$200k+	4.1%
Median income	$56,173

Housing

Home values

Under $50k 2.2%

$50k–$100k 3.6%

$100k–$150k 15.0%

$150k–$200k 16.3%

$200k–$300k 32.0%

$300k–$500k 21.7%

$500k–$1M 6.6%

$1M+ 2.6%

Housing overview

Metric	Value
Median home value	$245,200
Median rent / month	$1,154
Owner occupied	70.4%
Renter occupied	29.6%
Vacant	9.9%
Single-family detached	78.3%
Large apartment buildings	2.6%
Mobile homes	5.2%
Median rooms	5.9
Avg household size (owned)	2.76

Year built

Era	%
2020 or later	0.0%
2010–2019	2.1%
2000–2009	13.9%
1990–1999	19.5%
1980–1989	16.7%
1970–1979	12.9%
1960–1969	5.5%
1950–1959	7.0%
1940–1949	3.9%
1939 or earlier	18.5%

Bedrooms

Size	% of units
No bedroom (studio)	0.4%
1 bedroom	8.7%
2 bedrooms	19.3%
3 bedrooms	54.4%
4 bedrooms	11.2%
5+ bedrooms	6.0%

Vehicles per household

Vehicles	% of households
No vehicle	7.4%
1 vehicle	27.5%
2 vehicles	24.8%
3 or more	40.3%

Heating fuel

Fuel type	%
Utility gas	1.6%
Electricity	64.9%
Propane / LP gas	10.6%
Fuel oil	14.0%
Wood	7.5%
No fuel used	1.2%

Households & families

Household type	Count	%
Married-couple family	786	45.9%
Cohabiting couple	153	8.9%
Male householder, no spouse	377	22.0%
Female householder, no spouse	395	23.1%
Households with children under 18	693	40.5%
Households with seniors (65+)	483	28.2%
Average household size	2.76

Marital status

Status	Male	Female
Never married	25.8%	35.4%
Married	49.1%	44.9%
Separated	1.1%	1.1%
Widowed	9.7%	5.1%
Divorced	14.3%	13.5%

Education

Less than 9th grade 7.3%

Some HS, no diploma 9.0%

HS graduate 43.5%

Some college, no degree 22.4%

Associate's degree 6.6%

Bachelor's degree 6.8%

Graduate / professional 4.3%

Metric	%
HS diploma or higher	83.7%
Bachelor's or higher	11.1%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	29	2.3%
Kindergarten	36	2.8%
Elementary school	608	47.8%
High school	253	19.9%
College / grad school	347	27.3%

Employment

Industry of employment

Education & healthcare 22.7%

Construction 20.6%

Agriculture & mining 11.7%

Retail trade 7.3%

Transportation & utilities 7.3%

Professional & management 6.1%

Arts, food & hospitality 6.1%

Finance & real estate 5.5%

Public administration 5.2%

Manufacturing 3.0%

Wholesale trade 2.9%

Other services 1.8%

Occupation

Category	%
Management, business & arts	30.6%
Service	14.3%
Sales & office	22.0%
Natural resources & construction	23.4%
Production & transportation	9.7%

Employment type

Type	%
Private sector	68.9%
Government	16.8%
Self-employed	14.3%
Unpaid family workers	0.0%

Commute

Method	%
Drive alone	78.4%
Carpool	8.5%
Public transit	0.0%
Walk	7.6%
Work from home	2.9%
Other means	2.7%
Avg commute (minutes)	34.2

Poverty

All people 17.8%

Under 18 years 32.7%

18 and over 12.1%

Married-couple families 4.6%

Female-led households 43.8%

Income support

Source	% of households
Social Security	35.2%
Retirement income	24.1%
Supplemental Security	3.4%
Cash public assistance	1.9%
Food stamps / SNAP	18.8%

Health indicators

Condition	%
Obesity	38.4%
High blood pressure	34.4%
High cholesterol	33.9%
Diabetes	11.3%
Heart disease	6.3%
Stroke	3.3%
Asthma	11.0%
Arthritis	27.3%
Kidney disease	2.9%
Pulmonary disease	7.8%
Cancer	6.1%

Behavior / access	%
Smoking	20.2%
Binge drinking	15.2%
No physical activity	26.7%
Less than 7 hrs sleep	35.2%
Depression	22.5%
Fair or poor health	15.8%
Poor mental health	17.0%
Poor physical health	10.9%
No health insurance	12.4%
Visited doctor (checkup)	77.7%
Visited dentist	58.2%
Cholesterol screening	89.1%
Teeth loss	15.0%

Veterans & disability

Veterans	Count	%
Civilian veterans	242	7.1%

Disability	%
Any disability	9.2%
Under 18	5.2%
18–64 years	6.5%
65 and over	29.8%

Health insurance coverage

Type	%
Private insurance	51.5%
Public insurance	47.6%
No insurance	11.5%
Uninsured under 19	5.0%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	4,345	91.8%
Spanish	387	8.9%
Other Indo-European	382	8.8%
Asian & Pacific Islander	0	0.0%
Other languages	5	0.1%

Place of birth & citizenship

Origin	Count	%
Native born (US)	4,313	91.1%
Born in same state	4,258	89.9%
Born in different state	3,380	71.4%
Foreign born	55	1.2%
Naturalized citizen	421	8.9%
Not a US citizen	14	3.3%

Ancestry

Ancestry	Count	%
French	763	16.1%
Italian	567	12%
Arab	380	8%
English	111	2.3%

Ancestry	Count	%
Norwegian	101	2.1%
Dutch	19	0.4%
German	13	0.3%
Irish	8	0.2%

Technology access

Metric	% of households
Computer access	36.1%
Internet access	88.7%

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

Frequently asked questions about ZIP code 21639

What city is ZIP code 21639 in?

ZIP code 21639 is primarily assigned to Greensboro, Maryland.

What county is ZIP code 21639 in?

ZIP code 21639 falls within Caroline County, Maryland.

How educated is the population of ZIP code 21639?

11% of residents hold a bachelor's degree or higher — below the national average of ~33%, consistent with a trades-oriented local economy.

What is the poverty rate in ZIP code 21639?

18% of residents in ZIP code 21639 live below the poverty line, above the national average.

Does ZIP code 21639 have a large retiree population?

35% of households in ZIP code 21639 receive Social Security income, suggesting a significant retiree or disability population.

What is the population of ZIP code 21639?

ZIP code 21639 has an estimated population of 4,734 residents, with a density of 143 people per square mile.

What timezone is ZIP code 21639 in?

ZIP code 21639 observes the EST timezone.