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COUNTY · 2020 ACS

St. Mary's County

Maryland · 113,777 residents · 358.564 sq mi
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The short version

St. Mary's County is significantly wealthier than the US average, with a median household income of $95,864. Population has grown 32% since 2000. Median home value has more than doubled since 2000, reaching $318,500.

At a glance
Wealthier
above the US median
US median: $66,278
Younger
median age 37.1
US median: 38.8
Average education
32% hold a bachelor's degree
US average: 33%
Less affordable
home values up 43%, inflation adjusted
US median home: $265,253
Section 01

Population & growth

Total population
113,777
+32%since 2000
from 86,211 in 2000
1990 – 2025
Median age
37.1
+8%since 2000
from 34.2 in 2000
US average: 38.8
Population, 1990 – 2024
72K84K96K107K119K1990201020202024St. Mary's County
2024115K
1990201020202024
Age distribution, 2020
Under 56%(6,870)
US avg: 5.6%
5 to 96.7%(7,620)
US avg: 6.1%
10 to 147.2%(8,154)
US avg: 6.5%
15 to 197%(7,939)
US avg: 6.6%
20 to 246.6%(7,454)
US avg: 6.7%
25 to 3413.7%(15,630)
US avg: 13.5%
35 to 4412.5%(14,266)
US avg: 12.7%
45 to 5412.9%(14,728)
US avg: 12.3%
55 to 6413.8%(15,709)
US avg: 13.1%
65 to 748.2%(9,327)
US avg: 10%
75 to 844%(4,560)
US avg: 4.9%
85 and over1.3%(1,520)
US avg: 1.9%
BAR + DOT: THIS PLACE · TICK: US AVERAGE
Section 02

Income & economy

Median household income
$95,864
+17%inflation adjusted, since 2000
from $54,706 in 2000
US average: $66,278
1990 – 2024
Per capita income
$41,430
+83%since 2000
from $22,662 in 2000
US average: $35,364
Households earning $100K+
61.3%
+10.9 ptssince 2009
from 50.4% in 2009
US average: 43.9%
Poverty rate
8.0%
+0.8 ptssince 2000
from 7.2% in 2000
US average: 12.8%
Workforce by industry, 2020
Wholesale trade10.3%
US avg: 6.7%
Information9.8%
US avg: 11.1%
Finance & insurance5%
US avg: 5.5%
Retail trade4.2%
US avg: 10%
Professional, scientific, technical4%
US avg: 4.7%
Other services2.9%
US avg: 6.6%
Public administration1.2%
US avg: 4.7%
Arts, entertainment, food1.1%
US avg: 2%
Education & health services1%
US avg: 0.8%
Transportation & warehousing1%
US avg: 2.5%
Agriculture, forestry, fishing0.7%
US avg: 1.7%
Construction0.6%
US avg: 1.2%
Manufacturing0.2%
US avg: 0.5%
BAR + DOT: THIS PLACE · TICK: US AVERAGE
Section 03

Housing

Median home value
$318,500
+43%inflation adjusted, since 2000
from $148,000 in 2000
US average: $265,253
1990 – 2024
Median gross rent
$1,436
+33%inflation adjusted, since 2000
from $719 in 2000
US average: $1,124
Owner-occupied
71.2%
−0.6 ptssince 2000
from 71.8% in 2000
28.8% rent
Afford Score
3.3
−22%since 2009
from 4.2 in 2009
2009 – 2024
Our index: median home value divided by median household income. Lower is more affordable.
RELATED:See current rent listings in St. Mary's County on RentDataNow
Section 04

Race & ethnicity

2000
White, non-Hispanic80.4%(69,336)
Black13.8%(11,908)
Hispanic / Latino2%(1,720)
Asian1.8%(1,538)
Other0%
2020
White, non-Hispanic70.5%(80,233)
Black14.1%(15,994)
Hispanic / Latino5.8%(6,545)
Asian2.9%(3,301)
Other4.2%(4,803)
Segregation Score
32
Our index, 0 to 100. Higher means White and non-White residents are more separated across neighborhoods.
Section 04 · Origins

Detailed origins & ancestry

Hispanic origin
Mexican1.8%(2,015)
Puerto Rican0.8%(888)
Salvadoran0.6%(718)
Spaniard0.5%(530)
Colombian0.3%(395)
Guatemalan0.1%(168)
Venezuelan0.1%(160)
Ecuadorian0.1%(145)
Peruvian0.1%(67)
Cuban0.1%(58)
+ 5 more hispanic origin groups with data
Asian origin
Filipino1.4%(1,554)
Asian Indian0.4%(446)
Chinese0.3%(390)
Vietnamese0.1%(144)
Japanese0.1%(102)
Thai0.1%(60)
Pakistani0%(54)
Cambodian0%(38)
Taiwanese0%(22)
Korean0%(15)
Pacific Islander origin
Chamorro0%(22)
Ancestry
Irish15.5%(17,589)
German14.4%(16,324)
English11.6%(13,163)
American7.1%(8,079)
Italian5.2%(5,855)
French2.5%(2,853)
Scottish2.3%(2,622)
Polish2.2%(2,458)
British1.2%(1,323)
Dutch1.1%(1,270)
West Indian1%(1,091)
Norwegian0.9%(1,025)
+ 41 more ancestry groups with data
Scotch-Irish0.9%(989)
Russian0.7%(809)
Greek0.7%(758)
Welsh0.6%(684)
Swedish0.6%(640)
Czech0.5%(531)
Swiss0.4%(495)
Hungarian0.4%(431)
Danish0.3%(368)
Portuguese0.2%(276)
Slovak0.2%(276)
Ukrainian0.2%(229)
Finnish0.2%(224)
Haitian0.2%(208)
Jamaican0.2%(198)
Lithuanian0.2%(190)
Iranian0.2%(171)
Belgian0.1%(138)
Bulgarian0.1%(122)
Armenian0.1%(119)
Australian0.1%(110)
Romanian0.1%(93)
Canadian0.1%(90)
Austrian0.1%(85)
Lebanese0.1%(63)
Barbadian0%(52)
Serbian0%(47)
Somali0%(44)
Latvian0%(31)
Croatian0%(27)
Syrian0%(26)
Egyptian0%(24)
Ethiopian0%(21)
Nigerian0%(21)
Slovene0%(16)
Arab0%(11)
RANKED:Largest Irish population · Largest German population · Largest English population · Largest American population · Largest Italian population
Section 05

Education

Bachelor's degree or higher
32.0%
+9.5 ptssince 2000
from 22.6% in 2000
US average: 32.9%
High school or higher
90.4%
+5.0 ptssince 2000
from 85.3% in 2000
US average: 88.5%
Graduate degree
13.5%
+5.3 ptssince 2000
from 8.2% in 2000
US average: 12.7%
Section 06

Commute & transportation

Average commute
31.7 min
+53%since 2000
from 20.7 min in 2000
US average: 26.9
Drive alone to work
80.0%
−2.1 ptssince 2009
from 82.1% in 2009
US average: 75.1%
No vehicle available
4.6%
−0.2 ptssince 2009
from 4.8% in 2009
US average: 8.4%
Section 07

Work & employment

Unemployment rate
3.5%
−1.3 ptssince 2011
from 4.8% in 2011
US average: 5.4%
Labor force participation
67.5%
−2.6 ptssince 2011
from 70.1% in 2011
US average: 63.4%
Management & professional
46.2%
−22.0 ptssince 2009
from 68.2% in 2009
US average: 39.3%
Section 08

People & community

Male
50.0%
+0.1 ptssince 2009
from 49.8% in 2009
Female
50.0%
−0.1 ptssince 2009
from 50.2% in 2009
Foreign born
5.2%
+1.7 ptssince 2009
from 3.5% in 2009
US average: 13.5%
Uninsured
4.7%
−87.1 ptssince 2013
from 91.8% in 2013
US average: 8.8%
Marital status (2024)
Men 15+
Never married35.6%(16,557)
Married53.8%(25,010)
Widowed2.8%(1,291)
Divorced7.8%(3,628)
Women 15+
Never married29.3%(13,493)
Married53.3%(24,542)
Widowed7.4%(3,391)
Divorced10%(4,584)
SHARE WITHIN EACH SEX · POPULATION 15 AND OVER · 2024
Drill deeper

Places similar to St. Mary's County

Fayette County
Pop 125,156
Napa County
Pop 132,949
Dallas County
Pop 118,457
Kendall County
Pop 145,470
Places similar to St. Mary's County
Head to head

Compare St. Mary's County to nearby counties

ST. MARY'S COUNTY VS
Westmoreland County
Income$63,398−34%
Home value$269,600−15%
Population19,715−83%
SEE FULL COMPARISON →
ST. MARY'S COUNTY VS
Calvert County
Income$133,922+40%
Home value$460,200+44%
Population94,484−19%
SEE FULL COMPARISON →
ST. MARY'S COUNTY VS
Richmond County
Income$66,304−31%
Home value$231,500−27%
Population9,294−92%
SEE FULL COMPARISON →
ST. MARY'S COUNTY VS
Northumberland County
Income$66,480−31%
Home value$346,800+9%
Population12,557−89%
SEE FULL COMPARISON →
Frequently asked

How many people live in St. Mary's County, Maryland?

St. Mary's County, Maryland has about 113,777 residents according to the 2020 American Community Survey.

What is the median household income in St. Mary's County, Maryland?

The typical household in St. Mary's County, Maryland earns about $95,864 a year. Half of households make more than that, and half make less.

Is St. Mary's County, Maryland expensive?

In St. Mary's County, Maryland, the median home is worth about $318,500, and the typical rent is about $1,436 a month.

How educated are people in St. Mary's County, Maryland?

About 32.0% of adults age 25 and over in St. Mary's County, Maryland hold a bachelor's degree or higher.

What is the poverty rate in St. Mary's County, Maryland?

About 8.0% of people in St. Mary's County, Maryland live below the federal poverty line.

Has St. Mary's County, Maryland grown since 1990?

Yes, St. Mary's County, Maryland has grown since 1990. The population has added about 37,803 residents, a change of about 50 percent over that period.

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Explore from here

23 census tracts (top 20 by population)
Census Tract 8756.02Census Tract 8755.01Census Tract 8760.04Census Tract 8757Census Tract 8754Census Tract 8762Census Tract 8750Census Tract 8752.02Census Tract 8758.03Census Tract 8752.01Census Tract 8751Census Tract 8760.01Census Tract 8759.04Census Tract 8759.06Census Tract 8755.02Census Tract 8761.01Census Tract 8760.03Census Tract 8753Census Tract 8761.02Census Tract 8759.03
26 ZIP codes
ZIP 20653ZIP 20659ZIP 20650ZIP 20619ZIP 20636ZIP 20634ZIP 20670ZIP 20618ZIP 20620ZIP 20690ZIP 20686ZIP 20621ZIP 20684ZIP 20624ZIP 20674ZIP 20609ZIP 20680ZIP 20630ZIP 20692ZIP 20628ZIP 20687ZIP 20606ZIP 20626ZIP 20667ZIP 20656ZIP 20660
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DATA: US CENSUS BUREAU ACS 5-YEAR + DECENNIAL CENSUS · UPDATED 2024

How we source and harmonize this data →