St. Mary's County, Maryland

11 cities & places have their primary county here.

Population: 114,372
Median household income: $114,580
Median home value: $390,900

St. Mary's County, Maryland counts 114,372 residents. 11 cities and places have their primary county here. At $114,580, its median household income sits above Maryland's $101,652.

Between 2019 and 2023, St. Mary's County's population grew 1.9% from 112,290 to 114,372, while its median household income rose 27.5% from $89,845 to $114,580.

The typical home was built around 1992. 7.4% of residents live below the poverty line.

Demographics

ACS 2019–2023

Population: 114,372
Median age: 37.0 yrs
Median household income: $114,580
Median home value: $390,900
Median gross rent: $1,692
Housing units: 46,078
Homeownership rate: 72.6%
Bachelor's degree or higher: 35.1%
Unemployment rate: 3.8%

Trends

ACS 5-year · 2019–2023

Population

112,290114,372

Median household income

$89,845$114,580

Median home value

$301,300$390,900

Median gross rent

$1,398$1,692

Year	Population	Median household income	Median home value	Median gross rent
2019	112,290	$89,845	$301,300	$1,398
2020	113,182	$95,864	$318,500	$1,436
2021	113,209	$102,859	$326,800	$1,492
2022	113,814	$113,668	$376,900	$1,595
2023	114,372	$114,580	$390,900	$1,692

Each year is a US Census Bureau ACS 5-year estimate ending that year.

Age distribution

Under 56.1%

5 to 1717.9%

18 to 248.8%

25 to 3414.0%

35 to 4413.6%

45 to 5412.3%

55 to 6413.5%

65 to 748.4%

75 and over5.3%

	Count	Share
Under 5	6,997	6.1%
5 to 17	20,502	17.9%
18 to 24	10,090	8.8%
25 to 34	15,978	14.0%
35 to 44	15,535	13.6%
45 to 54	14,107	12.3%
55 to 64	15,452	13.5%
65 to 74	9,605	8.4%
75 and over	6,106	5.3%

Race & ethnicity

	Count	Share
White (non-Hispanic)	81,155	71.0%
Black or African American	16,744	14.6%
American Indian & Alaska Native	69	0.1%
Asian	2,908	2.5%
Native Hawaiian & Pacific Islander	0	0.0%
Some other race	343	0.3%
Two or more races	6,348	5.6%
Hispanic or Latino (any race)	6,805	5.9%

Educational attainment (age 25+)

No high school diploma7.6%

High school graduate28.6%

Some college or associate's28.6%

Bachelor's degree20.0%

Graduate or professional degree15.1%

	Count	Share
No high school diploma	5,859	7.6%
High school graduate	21,998	28.6%
Some college or associate's	21,975	28.6%
Bachelor's degree	15,325	20.0%
Graduate or professional degree	11,626	15.1%

Commute to work

Mean travel time to work: 30 min

Drove alone75.0%

Carpooled5.4%

Public transit1.0%

Walked2.4%

Bicycle0.1%

Worked from home15.3%

Other means0.8%

How workers get to work

	Count	Share
Drove alone	43,724	75.0%
Carpooled	3,142	5.4%
Public transit	567	1.0%
Walked	1,384	2.4%
Bicycle	85	0.1%
Worked from home	8,898	15.3%
Other means	495	0.8%

Travel time

	Count	Share
Under 15 min	11,142	22.6%
15 to 29 min	19,120	38.7%
30 to 44 min	8,765	17.7%
45 to 59 min	2,918	5.9%
60+ min	7,452	15.1%

Households

Average household size: 2.68
Poverty rate: 7.4% (8,344 of 112,006)

	Count	Share
Family households	29,853	71.5%
Nonfamily households	11,890	28.5%

Housing

Median year structure built: 1992

Occupancy

	Count	Share
Occupied	41,743	90.6%
Vacant	4,335	9.4%

Tenure (of occupied units)

	Count	Share
Owner-occupied	30,325	72.6%
Renter-occupied	11,418	27.4%

1-unit, detached73.3%

1-unit, attached9.9%

2 to 4 units2.0%

5 to 19 units6.8%

20 or more units4.7%

Mobile home & other3.4%

Units in structure

	Count	Share
1-unit, detached	33,775	73.3%
1-unit, attached	4,570	9.9%
2 to 4 units	912	2.0%
5 to 19 units	3,122	6.8%
20 or more units	2,154	4.7%
Mobile home & other	1,545	3.4%

Geography

County GEOID: 24037
State: Maryland
Land area: 359 sq mi
Water area: 406 sq mi
Center point: 38.2231, -76.5345