20659 ZIP Code — Mechanicsville, MD

Saint Marys County, Maryland

ZIP code 20659 is located in Mechanicsville, Maryland, within Saint Marys County. It covers approximately 97.01 square miles and serves a population of 23,346 residents. This is a standard ZIP code in the Eastern (ET) timezone, served by area code 240/301.

About ZIP code 20659

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 $371,100. Owner-occupancy is high at 89%, well above the national average.

Median household income is $115,729. The poverty rate of 7% is below the national average.

The dominant occupation class is management, business, and professional, with education and healthcare as the leading industry. An above-average commute of 42 minutes suggests many residents work outside the immediate area.

Educational attainment is near the national average, with 24% of residents holding a bachelor's degree or higher.

Notable community characteristics include a notable veteran presence at 11% of civilians, above the national average of 7%.

Overall, ZIP code 20659 reflects a community defined by a strong veteran community and high homeownership.

23,346

population

97.01

sq mi land

Standard

ZIP type

Eastern (ET)

timezone

20659 ZIP code map

Cities in ZIP code 20659

Below are the cities the US Postal Service accepts for ZIP code 20659. Using any city not on this list may result in mail delivery delays.

City	Status
Mechanicsville	Acceptable
Mechanicsville	Preferred

Nearby ZIP codes

20656 Loveville (4.9 mi) 20624 Clements (6.6 mi) 20622 Charlotte Hall (7 mi) 20678 Prince Frederick (8.1 mi) 20615 Broomes Island (8.2 mi) 20621 Chaptico (8.3 mi) 20637 Hughesville (8.4 mi) 20636 Hollywood (8.4 mi) 20685 Saint Leonard (9 mi) 20676 Port Republic (9.7 mi) 20618 Bushwood (10.5 mi) 20608 Aquasco (11 mi)

Demographics updated 05/2026

Population
Total population	23,346
Population density	241 / sq mi
State FIPS	24
County FIPS	037

Geography
Land area	97.01 sq mi
Water area	9.49 sq mi
Latitude	38.4232
Longitude	-76.6985
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	19.9%	24.3%	28.2%
$50k – $100k	30.1%	27.4%	28.2%
$100k – $200k	39.3%	36.2%	30.1%
Over $200k	10.7%	12.1%	13.4%

Demographics & statistics

23,346

Population

241

People per sq mi

38.1

Median age

$115,729

Median household income

$46,226

Per capita income

$371,100

Median home value

$1,583

Median monthly rent

89.3%

Home ownership

7.1%

Poverty rate

3.8%

Unemployment

7,562

Housing units

24.1%

Bachelor's or higher

Age distribution

Male Female

854

Under 5

840

982

5–9

965

813

10–14

800

746

15–19

733

682

20–24

671

1,285

25–34

1,263

1,605

35–44

1,578

1,507

45–54

1,481

751

55–59

739

764

60–64

752

989

65–74

972

623

75–84

613

170

85+

168

← Male

Female →

Age summary

Group	Count	%
Under 18	6,170	26.4%
18 and over	17,176	73.6%
65 and over	3,535	15.1%
Median age	38.1 years

Race & ethnicity

White 85.9%

Black or African American 6.6%

Two or more races 3.9%

Hispanic or Latino 2.5%

Other race 0.8%

Asian 0.3%

Group	Count	%
White	20,555	85.9%
Black or African American	1,577	6.6%
Two or more races	935	3.9%
Hispanic or Latino	589	2.5%
Other race	193	0.8%
Asian	81	0.3%

Household income

Income range	This ZIP	County avg	State avg
Under $50k	19.9%	24.3%	28.2%
$50k – $100k	30.1%	27.4%	28.2%
$100k – $200k	39.3%	36.2%	30.1%
Over $200k	10.7%	12.1%	13.4%

Under $10k 4.3%

$10k–$15k 1.4%

$15k–$25k 4.3%

$25k–$35k 2.8%

$35k–$50k 6.9%

$50k–$75k 13.3%

$75k–$100k 10.0%

$100k–$150k 21.9%

$150k–$200k 15.2%

$200k+ 19.9%

Range	% of households
Under $10k	4.3%
$10k–$15k	1.4%
$15k–$25k	4.3%
$25k–$35k	2.8%
$35k–$50k	6.9%
$50k–$75k	13.3%
$75k–$100k	10.0%
$100k–$150k	21.9%
$150k–$200k	15.2%
$200k+	19.9%
Median income	$115,729

Housing

Home values

Under $50k 1.5%

$50k–$100k 0.9%

$100k–$150k 1.5%

$150k–$200k 2.3%

$200k–$300k 18.5%

$300k–$500k 55.3%

$500k–$1M 18.6%

$1M+ 1.5%

Housing overview

Metric	Value
Median home value	$371,100
Median rent / month	$1,583
Owner occupied	89.3%
Renter occupied	10.7%
Vacant	5.0%
Single-family detached	94.9%
Large apartment buildings	0.0%
Mobile homes	2.4%
Median rooms	7.2
Avg household size (owned)	2.89

Year built

Era	%
2020 or later	0.3%
2010–2019	9.1%
2000–2009	13.3%
1990–1999	22.7%
1980–1989	22.2%
1970–1979	20.8%
1960–1969	3.3%
1950–1959	3.2%
1940–1949	2.1%
1939 or earlier	3.0%

Bedrooms

Size	% of units
No bedroom (studio)	0.0%
1 bedroom	1.2%
2 bedrooms	6.7%
3 bedrooms	47.5%
4 bedrooms	33.0%
5+ bedrooms	11.6%

Vehicles per household

Vehicles	% of households
No vehicle	4.7%
1 vehicle	15.1%
2 vehicles	35.5%
3 or more	44.6%

Heating fuel

Fuel type	%
Utility gas	0.7%
Electricity	61.5%
Propane / LP gas	5.9%
Fuel oil	22.5%
Wood	6.7%
Solar	0.2%
No fuel used	1.6%

Households & families

Household type	Count	%
Married-couple family	4,947	61.9%
Cohabiting couple	449	5.6%
Male householder, no spouse	1,005	12.6%
Female householder, no spouse	1,594	19.9%
Households with children under 18	2,862	35.8%
Households with seniors (65+)	2,452	30.7%
Average household size	2.92

Marital status

Status	Male	Female
Never married	31.1%	25.3%
Married	57.2%	56.2%
Separated	0.4%	2.4%
Widowed	4.1%	7.7%
Divorced	7.2%	8.4%

Education

Less than 9th grade 3.8%

Some HS, no diploma 6.4%

HS graduate 37.4%

Some college, no degree 21.3%

Associate's degree 7.1%

Bachelor's degree 14.2%

Graduate / professional 9.9%

Metric	%
HS diploma or higher	89.8%
Bachelor's or higher	24.1%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	395	7.3%
Kindergarten	481	8.9%
Elementary school	2,657	49.2%
High school	1,112	20.6%
College / grad school	754	14.0%

Employment

Industry of employment

Education & healthcare 18.4%

Public administration 17.2%

Construction 13.7%

Professional & management 12.5%

Retail trade 10.1%

Arts, food & hospitality 5.6%

Other services 4.9%

Manufacturing 4.6%

Transportation & utilities 4.4%

Finance & real estate 4.4%

Agriculture & mining 1.7%

Wholesale trade 1.6%

Information 1.1%

Occupation

Category	%
Management, business & arts	45.6%
Service	13.3%
Sales & office	19.1%
Natural resources & construction	13.5%
Production & transportation	8.6%

Employment type

Type	%
Private sector	65.6%
Government	28.1%
Self-employed	5.2%
Unpaid family workers	1.0%

Commute

Method	%
Drive alone	76.5%
Carpool	6.4%
Public transit	2.5%
Walk	1.1%
Work from home	12.9%
Other means	0.6%
Avg commute (minutes)	42.2

Poverty

All people 7.1%

Under 18 years 7.5%

18 and over 7.0%

Married-couple families 3.6%

Female-led households 16.8%

Income support

Source	% of households
Social Security	28.7%
Retirement income	30.5%
Supplemental Security	2.6%
Cash public assistance	1.4%
Food stamps / SNAP	5.2%

Health indicators

Condition	%
Obesity	37.0%
High blood pressure	33.0%
High cholesterol	33.9%
Diabetes	9.1%
Heart disease	5.1%
Stroke	2.4%
Asthma	10.0%
Arthritis	24.3%
Kidney disease	2.3%
Pulmonary disease	5.7%
Cancer	5.9%

Behavior / access	%
Smoking	17.8%
Binge drinking	16.6%
No physical activity	21.2%
Less than 7 hrs sleep	36.3%
Depression	18.0%
Fair or poor health	11.1%
Poor mental health	14.5%
Poor physical health	8.2%
No health insurance	9.7%
Visited doctor (checkup)	75.4%
Visited dentist	68.6%
Cholesterol screening	91.1%
Teeth loss	10.9%

Veterans & disability

Veterans	Count	%
Civilian veterans	1,955	11.4%

Disability	%
Any disability	9.5%
Under 18	4.2%
18–64 years	7.1%
65 and over	27.9%

Health insurance coverage

Type	%
Private insurance	82.2%
Public insurance	25.2%
No insurance	6.9%
Uninsured under 19	12.4%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	21,652	92.7%
Spanish	587	2.7%
Other Indo-European	102	0.5%
Asian & Pacific Islander	446	2.1%
Other languages	39	0.2%

Place of birth & citizenship

Origin	Count	%
Native born (US)	22,975	98.4%
Born in same state	22,789	97.6%
Born in different state	14,046	60.2%
Foreign born	186	0.8%
Naturalized citizen	371	1.6%
Not a US citizen	235	63.3%

Ancestry

Ancestry	Count	%
Italian	3,506	15%
French	3,421	14.7%
Arab	1,873	8%
English	324	1.4%

Ancestry	Count	%
Polish	204	0.9%
German	92	0.4%
Irish	69	0.3%
Dutch	32	0.1%

Technology access

Metric	% of households
Computer access	34.2%
Internet access	91.5%

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

Frequently asked questions about ZIP code 20659

What city is ZIP code 20659 in?

ZIP code 20659 is primarily assigned to Mechanicsville, Maryland.

What county is ZIP code 20659 in?

ZIP code 20659 falls within Saint Marys County, Maryland.

Is ZIP code 20659 mostly owner-occupied?

89% of occupied units in ZIP code 20659 are owner-occupied, well above the national average.

Does ZIP code 20659 have a large veteran population?

11% of civilians in ZIP code 20659 are veterans, above the national average of ~7%.

What is the typical home value in ZIP code 20659?

The median home value in ZIP code 20659 is $371,100.

What is the median household income in ZIP code 20659?

The median household income in ZIP code 20659 is $115,729, above the national median of ~$75,000.

What timezone is ZIP code 20659 in?

ZIP code 20659 observes the EST timezone.