St. Mary's County vs Washington County
A side-by-side comparison of St. Mary's County and Washington County: population, income, housing, and more.
St. Mary's County and Washington County are counties in Maryland. This page compares them across population, income, housing, education, commuting, and how each has changed since 2019.
Washington County has the higher population (155,033 vs 114,372 in St. Mary's County). St. Mary's County has the higher median household income ($114,580 vs $74,157 in Washington County). St. Mary's County has the higher median home value ($390,900 vs $275,900 in Washington County).
Population, income & housing
| St. Mary's County | Washington County | |
|---|---|---|
| Population | 114,372 | 155,033 |
| Median age | 37.0 yrs | 41.0 yrs |
| Median household income | $114,580 | $74,157 |
| Median home value | $390,900 | $275,900 |
| Median gross rent | $1,692 | $1,100 |
| Housing units | 46,078 | 63,965 |
| Homeownership rate | 72.6% | 65.9% |
| Bachelor's degree or higher | 35.1% | 23.5% |
| Unemployment rate | 3.8% | 4.9% |
Trends (ACS 5-year, 2019–2023)
| St. Mary's County | Washington County | |
|---|---|---|
| Population | 112,290 → 114,372 (+1.9%) | 150,109 → 155,033 (+3.3%) |
| Median household income | $89,845 → $114,580 (+27.5%) | $60,860 → $74,157 (+21.8%) |
| Median home value | $301,300 → $390,900 (+29.7%) | $210,300 → $275,900 (+31.2%) |
| Median gross rent | $1,398 → $1,692 (+21.0%) | $921 → $1,100 (+19.4%) |
St. Mary's County
112,290114,372
$89,845$114,580
$301,300$390,900
$1,398$1,692
Washington County
150,109155,033
$60,860$74,157
$210,300$275,900
$921$1,100
Age & race/ethnicity
Age distribution (share)
| St. Mary's County | Washington County | |
|---|---|---|
| Under 5 | 6.1% | 5.5% |
| 5 to 17 | 17.9% | 16.3% |
| 18 to 24 | 8.8% | 8.1% |
| 25 to 34 | 14.0% | 12.8% |
| 35 to 44 | 13.6% | 12.8% |
| 45 to 54 | 12.3% | 13.1% |
| 55 to 64 | 13.5% | 13.6% |
| 65 to 74 | 8.4% | 10.3% |
| 75 and over | 5.3% | 7.5% |
Race & ethnicity (share)
| St. Mary's County | Washington County | |
|---|---|---|
| White (non-Hispanic) | 71.0% | 74.5% |
| Black or African American | 14.6% | 11.3% |
| American Indian & Alaska Native | 0.1% | 0.1% |
| Asian | 2.5% | 1.6% |
| Native Hawaiian & Pacific Islander | 0.0% | 0.1% |
| Some other race | 0.3% | 0.3% |
| Two or more races | 5.6% | 4.8% |
| Hispanic or Latino | 5.9% | 7.3% |
Educational attainment (age 25+)
Share of adults 25+
| St. Mary's County | Washington County | |
|---|---|---|
| No high school diploma | 7.6% | 11.3% |
| High school graduate | 28.6% | 36.4% |
| Some college or associate's | 28.6% | 28.8% |
| Bachelor's degree | 20.0% | 13.7% |
| Graduate or professional degree | 15.1% | 9.8% |
Commute to work
How workers get to work (share)
| St. Mary's County | Washington County | |
|---|---|---|
| Drove alone | 75.0% | 75.3% |
| Carpooled | 5.4% | 9.6% |
| Public transit | 1.0% | 1.0% |
| Walked | 2.4% | 1.2% |
| Bicycle | 0.1% | 0.3% |
| Worked from home | 15.3% | 11.0% |
| Other means | 0.8% | 1.5% |
Housing
Units in structure (share)
| St. Mary's County | Washington County | |
|---|---|---|
| 1-unit, detached | 73.3% | 62.2% |
| 1-unit, attached | 9.9% | 15.2% |
| 2 to 4 units | 2.0% | 6.9% |
| 5 to 19 units | 6.8% | 9.7% |
| 20 or more units | 4.7% | 3.8% |
| Mobile home & other | 3.4% | 2.2% |
Poverty & households
| St. Mary's County | Washington County | |
|---|---|---|
| Poverty rate | 7.4% | 12.5% |
| Average household size | 2.68 | 2.48 |
| Mean commute (minutes) | 30 | 29 |
| Median year structure built | 1992 | 1974 |
Full profiles
2Related rankings
21- Largest by population — counties in Maryland
- Most densely populated — counties in Maryland
- Highest median household income — counties in Maryland
- Highest median home value — counties in Maryland
- Most affordable home values — counties in Maryland
- Highest median gross rent — counties in Maryland
- Cheapest median gross rent — counties in Maryland
- Oldest by median age — counties in Maryland
- Youngest by median age — counties in Maryland
- Most college-educated — counties in Maryland
- Highest poverty rate — counties in Maryland
- Lowest poverty rate — counties in Maryland
- Highest homeownership rate — counties in Maryland
- Lowest homeownership rate — counties in Maryland
- Longest commutes — counties in Maryland
- Shortest commutes — counties in Maryland
- Largest households — counties in Maryland
- Newest housing — counties in Maryland
- Oldest housing — counties in Maryland
- Fastest-growing (2019–2023) — counties in Maryland
- Fastest-shrinking (2019–2023) — counties in Maryland