20634 ZIP Code — Great Mills, MD

Saint Marys County, Maryland

ZIP code 20634 is located in Great Mills, Maryland, within Saint Marys County. It covers approximately 6.99 square miles and serves a population of 7,853 residents. This is a standard ZIP code in the Eastern (ET) timezone, served by area code 240/301.

About ZIP code 20634

The housing stock consists of a mix of housing types. Most homes were built in the 1990s, giving the area an established character. Median home value is $327,800. Owner-occupancy sits near the national average at 69%.

Median household income is $131,042. The poverty rate of 6% is below the national average.

The dominant occupation class is management, business, and professional, with public administration as the leading industry. The average commute of 26 minutes is near the national average.

Educational attainment is near the national average, with 38% of residents holding a bachelor's degree or higher.

Notable community characteristics include a notable veteran presence at 19% of civilians, above the national average of 7%.

7,853

population

6.99

sq mi land

Standard

ZIP type

Eastern (ET)

timezone

20634 ZIP code map

Cities in ZIP code 20634

Below are the cities the US Postal Service accepts for ZIP code 20634. Using any city not on this list may result in mail delivery delays.

City	Status
Great Mills	Preferred

Nearby ZIP codes

20620 Callaway (1.8 mi) 20667 Park Hall (3.4 mi) 20653 Lexington Park (3.5 mi) 20619 California (3.8 mi) 20692 Valley Lee (4 mi) 20670 Patuxent River (5.1 mi) 20630 Drayden (5.6 mi) 20688 Solomons (6.1 mi) 20688 Solomons (6.1 mi) 20690 Tall Timbers (6.2 mi) 20650 Leonardtown (7.6 mi) 20684 Saint Inigoes (8.5 mi)

Demographics updated 05/2026

Population
Total population	7,853
Population density	1,123 / sq mi
State FIPS	24
County FIPS	037

Geography
Land area	6.99 sq mi
Water area	0.07 sq mi
Latitude	38.2431
Longitude	-76.4942
Timezone	Eastern (ET)
Area code	240/301

Total population by age

Gender

Race & ethnicity

Economics updated 05/2026

Household income

Income range	This ZIP	County avg	State avg
Under $50k	21.0%	24.3%	28.2%
$50k – $100k	24.6%	27.4%	28.2%
$100k – $200k	45.5%	36.2%	30.1%
Over $200k	8.8%	12.1%	13.4%

Demographics & statistics

7,853

Population

1,123

People per sq mi

33.1

Median age

$131,042

Median household income

$55,890

Per capita income

$327,800

Median home value

$1,505

Median monthly rent

69.1%

Home ownership

5.5%

Poverty rate

0.6%

Unemployment

2,117

Housing units

38.0%

Bachelor's or higher

Age distribution

Male Female

239

Under 5

214

323

5–9

290

346

10–14

310

329

15–19

296

178

20–24

159

798

25–34

715

684

35–44

613

460

45–54

413

322

55–59

289

232

60–64

208

161

65–74

145

75–84

85+

← Male

Female →

Age summary

Group	Count	%
Under 18	2,013	25.6%
18 and over	5,840	74.4%
65 and over	435	5.5%
Median age	33.1 years

Race & ethnicity

White 54.7%

Black or African American 32%

Two or more races 6.5%

Hispanic or Latino 2.8%

Asian 2.2%

Other race 1.8%

Group	Count	%
White	4,418	54.7%
Black or African American	2,588	32%
Two or more races	523	6.5%
Hispanic or Latino	225	2.8%
Asian	178	2.2%
Other race	146	1.8%

Household income

Income range	This ZIP	County avg	State avg
Under $50k	21.0%	24.3%	28.2%
$50k – $100k	24.6%	27.4%	28.2%
$100k – $200k	45.5%	36.2%	30.1%
Over $200k	8.8%	12.1%	13.4%

Under $10k 0.6%

$10k–$15k 2.4%

$15k–$25k 3.7%

$25k–$35k 1.8%

$35k–$50k 8.6%

$50k–$75k 9.7%

$75k–$100k 11.0%

$100k–$150k 20.5%

$150k–$200k 19.2%

$200k+ 22.4%

Range	% of households
Under $10k	0.6%
$10k–$15k	2.4%
$15k–$25k	3.7%
$25k–$35k	1.8%
$35k–$50k	8.6%
$50k–$75k	9.7%
$75k–$100k	11.0%
$100k–$150k	20.5%
$150k–$200k	19.2%
$200k+	22.4%
Median income	$131,042

Housing

Home values

Under $50k 7.3%

$50k–$100k 0.8%

$150k–$200k 9.3%

$200k–$300k 24.1%

$300k–$500k 47.8%

$500k–$1M 9.1%

$1M+ 1.6%

Housing overview

Metric	Value
Median home value	$327,800
Median rent / month	$1,505
Owner occupied	69.1%
Renter occupied	30.9%
Vacant	7.1%
Single-family detached	62.5%
Large apartment buildings	0.6%
Mobile homes	3.4%
Median rooms	6.5
Avg household size (owned)	3.15

Year built

Era	%
2020 or later	0.0%
2010–2019	8.2%
2000–2009	27.6%
1990–1999	34.3%
1980–1989	18.9%
1970–1979	6.6%
1960–1969	0.0%
1950–1959	1.8%
1940–1949	0.7%
1939 or earlier	1.9%

Bedrooms

Size	% of units
No bedroom (studio)	1.2%
1 bedroom	0.6%
2 bedrooms	16.8%
3 bedrooms	41.6%
4 bedrooms	31.2%
5+ bedrooms	8.7%

Vehicles per household

Vehicles	% of households
No vehicle	4.9%
1 vehicle	18.0%
2 vehicles	42.2%
3 or more	34.9%

Heating fuel

Fuel type	%
Utility gas	24.3%
Electricity	66.2%
Propane / LP gas	4.7%
Fuel oil	1.9%
Wood	0.4%
Solar	0.9%
No fuel used	1.6%

Households & families

Household type	Count	%
Married-couple family	1,297	47.0%
Cohabiting couple	159	5.8%
Male householder, no spouse	749	27.1%
Female householder, no spouse	555	20.1%
Households with children under 18	912	33.0%
Households with seniors (65+)	333	12.1%
Average household size	2.84

Marital status

Status	Male	Female
Never married	43.3%	32.8%
Married	44.4%	48.6%
Separated	3.6%	2.4%
Widowed	3.7%	4.7%
Divorced	5.1%	11.5%

Education

Less than 9th grade 1.1%

Some HS, no diploma 3.1%

HS graduate 24.8%

Some college, no degree 22.4%

Associate's degree 10.7%

Bachelor's degree 21.8%

Graduate / professional 16.1%

Metric	%
HS diploma or higher	95.8%
Bachelor's or higher	38.0%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	210	8.5%
Kindergarten	214	8.6%
Elementary school	920	37.1%
High school	463	18.7%
College / grad school	675	27.2%

Employment

Industry of employment

Public administration 20.1%

Education & healthcare 18.0%

Professional & management 15.5%

Retail trade 14.2%

Arts, food & hospitality 6.9%

Transportation & utilities 6.2%

Construction 5.4%

Other services 4.9%

Manufacturing 3.7%

Information 1.9%

Agriculture & mining 1.8%

Finance & real estate 1.3%

Occupation

Category	%
Management, business & arts	48.2%
Service	13.1%
Sales & office	19.3%
Natural resources & construction	7.3%
Production & transportation	12.1%

Employment type

Type	%
Private sector	59.7%
Government	37.7%
Self-employed	2.6%
Unpaid family workers	0.0%

Commute

Method	%
Drive alone	75.5%
Carpool	5.3%
Public transit	0.9%
Walk	6.2%
Work from home	12.1%
Other means	0.0%
Avg commute (minutes)	25.5

Poverty

All people 5.5%

Under 18 years 4.5%

18 and over 5.8%

Married-couple families 0.0%

Female-led households 28.3%

Income support

Source	% of households
Social Security	11.9%
Retirement income	23.1%
Supplemental Security	2.0%
Cash public assistance	0.0%
Food stamps / SNAP	7.1%

Health indicators

Condition	%
Obesity	38.5%
High blood pressure	31.8%
High cholesterol	30.5%
Diabetes	9.1%
Heart disease	4.3%
Stroke	2.3%
Asthma	10.4%
Arthritis	21.4%
Kidney disease	2.2%
Pulmonary disease	4.9%
Cancer	4.7%

Behavior / access	%
Smoking	17.5%
Binge drinking	16.1%
No physical activity	21.9%
Less than 7 hrs sleep	38.3%
Depression	17.3%
Fair or poor health	11.5%
Poor mental health	14.9%
Poor physical health	7.9%
No health insurance	10.7%
Visited doctor (checkup)	75.5%
Visited dentist	66.1%
Cholesterol screening	90.6%
Teeth loss	11.6%

Veterans & disability

Veterans	Count	%
Civilian veterans	1,117	19.4%

Disability	%
Any disability	8.6%
Under 18	1.8%
18–64 years	9.8%
65 and over	25.3%

Health insurance coverage

Type	%
Private insurance	84.8%
Public insurance	22.6%
No insurance	1.6%
Uninsured under 19	0.0%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	7,400	94.2%
Spanish	131	1.8%
Other Indo-European	35	0.5%
Asian & Pacific Islander	0	0.0%
Other languages	71	1.0%

Place of birth & citizenship

Origin	Count	%
Native born (US)	7,309	93.1%
Born in same state	7,054	89.8%
Born in different state	2,844	36.2%
Foreign born	255	3.2%
Naturalized citizen	544	6.9%
Not a US citizen	417	76.7%

Ancestry

Ancestry	Count	%
Italian	1,150	14.6%
French	689	8.8%
Arab	277	3.5%
Polish	92	1.2%

Ancestry	Count	%
Dutch	37	0.5%
Irish	19	0.2%
English	11	0.1%

Technology access

Metric	% of households
Computer access	35.1%
Internet access	99.1%

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

Frequently asked questions about ZIP code 20634

What city is ZIP code 20634 in?

ZIP code 20634 is primarily assigned to Great Mills, Maryland.

What county is ZIP code 20634 in?

ZIP code 20634 falls within Saint Marys County, Maryland.

Does ZIP code 20634 have a large veteran population?

19% of civilians in ZIP code 20634 are veterans, above the national average of ~7%.

What is the median household income in ZIP code 20634?

The median household income in ZIP code 20634 is $131,042, above the national median of ~$75,000.

What is the typical home value in ZIP code 20634?

The median home value in ZIP code 20634 is $327,800.

What is the population of ZIP code 20634?

ZIP code 20634 has an estimated population of 7,853 residents, with a density of 1,123 people per square mile.

What timezone is ZIP code 20634 in?

ZIP code 20634 observes the EST timezone.