Allegany County vs St. Mary's County

A side-by-side comparison of Allegany County and St. Mary's County: population, income, housing, and more.

Allegany County and St. Mary's County are counties in Maryland. This page compares them across population, income, housing, education, commuting, and how each has changed since 2019.

St. Mary's County has the higher population (114,372 vs 67,762 in Allegany County). St. Mary's County has the higher median household income ($114,580 vs $57,393 in Allegany County). St. Mary's County has the higher median home value ($390,900 vs $149,200 in Allegany County).

Population, income & housing

	Allegany County	St. Mary's County
Population	67,762	114,372
Median age	41.7 yrs	37.0 yrs
Median household income	$57,393	$114,580
Median home value	$149,200	$390,900
Median gross rent	$786	$1,692
Housing units	32,810	46,078
Homeownership rate	70.3%	72.6%
Bachelor's degree or higher	21.1%	35.1%
Unemployment rate	5.9%	3.8%

Trends (ACS 5-year, 2019–2023)

	Allegany County	St. Mary's County
Population	71,445 → 67,762 (-5.2%)	112,290 → 114,372 (+1.9%)
Median household income	$45,893 → $57,393 (+25.1%)	$89,845 → $114,580 (+27.5%)
Median home value	$120,700 → $149,200 (+23.6%)	$301,300 → $390,900 (+29.7%)
Median gross rent	$694 → $786 (+13.3%)	$1,398 → $1,692 (+21.0%)

Allegany County

Population

71,44567,762

Median household income

$45,893$57,393

Median home value

$120,700$149,200

Median gross rent

$694$786

St. Mary's County

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

Age & race/ethnicity

Age distribution (share)

	Allegany County	St. Mary's County
Under 5	4.6%	6.1%
5 to 17	13.2%	17.9%
18 to 24	11.5%	8.8%
25 to 34	12.2%	14.0%
35 to 44	12.0%	13.6%
45 to 54	12.1%	12.3%
55 to 64	13.5%	13.5%
65 to 74	11.6%	8.4%
75 and over	9.4%	5.3%

Race & ethnicity (share)

	Allegany County	St. Mary's County
White (non-Hispanic)	86.4%	71.0%
Black or African American	7.0%	14.6%
American Indian & Alaska Native	0.1%	0.1%
Asian	0.9%	2.5%
Native Hawaiian & Pacific Islander	0.0%	0.0%
Some other race	0.4%	0.3%
Two or more races	3.2%	5.6%
Hispanic or Latino	1.9%	5.9%

Educational attainment (age 25+)

Share of adults 25+

	Allegany County	St. Mary's County
No high school diploma	10.3%	7.6%
High school graduate	40.8%	28.6%
Some college or associate's	27.8%	28.6%
Bachelor's degree	11.8%	20.0%
Graduate or professional degree	9.4%	15.1%

Commute to work

How workers get to work (share)

	Allegany County	St. Mary's County
Drove alone	79.5%	75.0%
Carpooled	7.8%	5.4%
Public transit	0.5%	1.0%
Walked	2.6%	2.4%
Bicycle	0.0%	0.1%
Worked from home	8.8%	15.3%
Other means	0.8%	0.8%

Housing

Units in structure (share)

	Allegany County	St. Mary's County
1-unit, detached	72.7%	73.3%
1-unit, attached	5.5%	9.9%
2 to 4 units	7.3%	2.0%
5 to 19 units	5.7%	6.8%
20 or more units	4.8%	4.7%
Mobile home & other	3.9%	3.4%

Poverty & households

	Allegany County	St. Mary's County
Poverty rate	17.2%	7.4%
Average household size	2.22	2.68
Mean commute (minutes)	22	30
Median year structure built	1958	1992