Washington County, Maryland Population 2026
Updated April 2026 · US Census ACS 2023 5-Year Estimates · 11th-largest in Maryland
The population of Washington County, Maryland is 155,033 as of the 2023 American Community Survey, making it the 11th-largest county in Maryland. The median household income is $74,157, the median home value is $275,900, and the median age is 41.0.
The population of Washington County has grown 6.4% since 2010 (147,727 → 157,228), a +0.45% annualized rate.
155,033
Population
+0.45%
Annual growth
339
People / sq mi
$74,157
Median Income
$275,900
Median Home Value
Washington County covers 458 sq mi of land at 338.7 people per square mile.
About Washington County, MD
What distinguishes Washington County is density: among the most densely settled of US counties, around 339 people per square mile. With 155,033 residents, Washington County is a county in Maryland. It ranks #11 among counties in Maryland by population.
The typical household earns $74,157 a year, below the US median of $78,538. About 8.6% of residents live below the federal poverty level, below the national 12.4%. The median home value is $275,900, with typical rent around $1,100.
Degree attainment is mid-range for US counties: 23.5% of adults hold a four-year degree, below the national 35.0%. A solid 11.0% of workers are based at home, below the national 14.0%, and the average commute runs about 30 minutes each way.
That density explains much of the rest of the profile in Washington County: denser places lean toward renting, shorter commutes by transit, and a younger working-age mix.
Washington County Population History (2010-2024)
The county of Washington County had a population of 147,727 in 2010 and 157,228 in 2024, a 6.4% growth over 14 years. The peak was 157,228 in 2024. Average annual growth rate: 0.45%.
157,228
Population (2024)
147,727
Population (2010)
157,228
Peak (2024)
0.45%
Avg Annual Growth
| Year | Population |
|---|---|
| 2010 | 147,727 |
| 2011 | 148,807 |
| 2012 | 149,090 |
| 2013 | 149,055 |
| 2014 | 149,128 |
| 2015 | 149,160 |
| 2016 | 149,715 |
| 2017 | 150,247 |
| 2018 | 150,699 |
| 2019 | 151,066 |
| 2020 | 154,677 |
| 2021 | 155,117 |
| 2022 | 155,407 |
| 2023 | 156,116 |
| 2024 | 157,228 |
Race & Ethnicity
| White | 76.8% |
| Black or African American | 11.5% |
| Asian | 0.0% |
| Hispanic or Latino (any race) | 1.1% |
| Two or More Races | 0.0% |
Age & Sex
41.0
Median Age
49.2%
Female
50.8%
Male
17.8%
Age 65+
Age Distribution
Children (under 15): 17.9% · Seniors (65+): 17.8%
Income & Poverty
| Median household income | $74,157$-27,495 vs state |
| Mean household income | $95,432 |
| Per-capita income | $37,391 |
| Poverty rate | 8.6%+2.3% vs state |
| Unemployment rate | 2.9% |
| Employment-to-population | 56.8% |
Top Industries by Employment
The largest employment sector in Washington County is professional & business services, accounting for 22.0% of workers.
How residents commute
1.0%
Drive alone
1.2%
Carpool
75.3%
Public transit
11.0%
Work from home
29.5 min
Avg commute
Housing
$275,900$-121,800 vs state
Median home value
$1,100
Median rent
65.9%
Homeownership rate
63,965
Total housing units
92.9%
Occupied
7.1%
Vacant
34.1%
Renter-occupied
Social & access
93.9%
With health insurance
93.5%
With broadband internet
29.1%
Foreign-born
7.3%
Veterans (18+)
15.3%
With a disability
90.6%
Speak language other than English at home
Education
88.7%
High School+
23.5%
Bachelor's+
Largest cities in Maryland
Other counties in Maryland
Part of Maryland
Metro areas in Maryland
County rankings
Frequently Asked Questions
Washington County, Maryland has a population of 155,033 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 11th-largest county in Maryland. Population density is 339 people per square mile.
The population of Washington County has grown 6.4% since 2010 (147,727 → 157,228), a +0.45% annualized rate.
The median household income in Washington County, Maryland is $74,157, with mean (average) household income of $95,432 and per-capita income of $37,391. 8.6% of residents live below the federal poverty level.
In Washington County, the largest racial and ethnic groups are White (76.8%), Black or African American (11.5%), Hispanic or Latino (1.1%). Figures are from the US Census Bureau's 2023 ACS 5-year estimates and reflect self-reported responses.
The median age in Washington County, Maryland is 41.0 years. Residents are 49.2% female and 50.8% male.
The median home value in Washington County is $275,900 and median monthly rent is $1,100. 65.9% of occupied housing units are owner-occupied. The county has 63,965 total housing units, 7.1% of which are vacant.
The largest employment sector in Washington County, Maryland is professional, scientific, and management services, employing 22.0% of workers. The unemployment rate is 2.9%.
Baltimore is among the largest cities associated with Washington County, Maryland, with a population of 577,193.
Washington County, MD Climate
Washington County, MD has an average annual temperature of 11.8°C (53°F) and receives about 980 mm of precipitation per year. The warmest month is July and the coldest is January. Figures are 1970–2000 climate normals.
11.8°C
Avg Temp
980
Precip (mm/yr)
Jul
Hottest Month
Jan
Coldest Month
| Month | Avg (°C/°F) | Precip |
|---|---|---|
| January | -1° / 30° | 67 mm |
| February | 1° / 33° | 62 mm |
| March | 5° / 42° | 82 mm |
| April | 11° / 52° | 84 mm |
| May | 17° / 62° | 100 mm |
| June | 22° / 71° | 95 mm |
| July | 24° / 75° | 89 mm |
| August | 23° / 74° | 85 mm |
| September | 19° / 67° | 81 mm |
| October | 13° / 55° | 82 mm |
| November | 7° / 45° | 82 mm |
| December | 2° / 35° | 71 mm |
1970–2000 normals from WorldClim 2.1 (~9 km grid). Precipitation can be less precise near mountains or coastlines, where rainfall varies sharply over short distances.
Best time to visit Washington County, MD
The most comfortable months to visit Washington County, MD are typically June, September and August, when temperatures are mildest and rainfall is relatively low. The hottest month is July (around 30°C high). The coldest is January (near -6°C low). May is usually the wettest month.
Where to stay near Washington County
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Data from the American Community Survey (ACS) 5-Year estimates.
Source: U.S. Census Bureau ACS, 2026.