Mason County, Washington Population 2026
Updated April 2026 · US Census ACS 2023 5-Year Estimates · 20th-largest in Washington
The population of Mason County, Washington is 66,968 as of the 2023 American Community Survey, making it the 20th-largest county in Washington. The median household income is $78,359, the median home value is $377,400, and the median age is 44.8.
The population of Mason County has grown 14.7% since 2010 (60,733 → 69,632), a +0.98% annualized rate.
66,968
Population
+0.98%
Annual growth
70
People / sq mi
$78,359
Median Income
$377,400
Median Home Value
Mason County covers 960 sq mi of land at 69.8 people per square mile.
About Mason County, WA
In Mason County, home values do the distinguishing — a median of $377,400. With 66,968 residents, Mason County is a county in Washington. It ranks #20 among counties in Washington by population.
The typical household earns $78,359 a year, near the US median of $78,538. Poverty runs at 7.7%, below the national 12.4%. Real estate commands a premium here — a median home value of $377,400, with typical rent around $1,205.
22.0% of adults 25 and older hold a bachelor’s degree, below the national average of 35.0%. Remote work is on the higher side at 11.6%, below the national 14.0%, and the average commute runs about 36 minutes each way.
High housing values reframe the income picture in Mason County — even solid earnings stretch less against home prices and rents at this level.
Mason County Population History (2010-2024)
The county of Mason County had a population of 60,733 in 2010 and 69,632 in 2024, a 14.7% growth over 14 years. The peak was 69,632 in 2024. Average annual growth rate: 0.99%.
69,632
Population (2024)
60,733
Population (2010)
69,632
Peak (2024)
0.99%
Avg Annual Growth
| Year | Population |
|---|---|
| 2010 | 60,733 |
| 2011 | 60,882 |
| 2012 | 60,689 |
| 2013 | 60,480 |
| 2014 | 60,613 |
| 2015 | 60,999 |
| 2016 | 62,166 |
| 2017 | 63,769 |
| 2018 | 65,533 |
| 2019 | 66,939 |
| 2020 | 66,033 |
| 2021 | 67,255 |
| 2022 | 68,238 |
| 2023 | 68,754 |
| 2024 | 69,632 |
Race & Ethnicity
| White | 78.3% |
| Black or African American | 1.0% |
| Asian | 0.0% |
| Hispanic or Latino (any race) | 6.6% |
| Two or More Races | 0.1% |
Age & Sex
44.8
Median Age
47.9%
Female
52.1%
Male
23.7%
Age 65+
Age Distribution
Children (under 15): 16.3% · Seniors (65+): 23.7%
Income & Poverty
| Median household income | $78,359$-16,593 vs state |
| Mean household income | $97,813 |
| Per-capita income | $38,685 |
| Poverty rate | 7.7%+1.3% vs state |
| Unemployment rate | 3.3% |
| Employment-to-population | 46.9% |
Top Industries by Employment
The largest employment sector in Mason County is professional & business services, accounting for 19.6% of workers.
How residents commute
1.3%
Drive alone
1.4%
Carpool
71.8%
Public transit
11.6%
Work from home
36.4 min
Avg commute
Housing
$377,400$-142,400 vs state
Median home value
$1,205
Median rent
81.1%
Homeownership rate
33,751
Total housing units
75.2%
Occupied
24.8%
Vacant
18.9%
Renter-occupied
Social & access
92.8%
With health insurance
95.0%
With broadband internet
37.8%
Foreign-born
13.6%
Veterans (18+)
19.3%
With a disability
90.0%
Speak language other than English at home
Education
91.1%
High School+
22.0%
Bachelor's+
Largest cities in Washington
Other counties in Washington
Part of Washington
Metro areas in Washington
County rankings
Frequently Asked Questions
Mason County, Washington has a population of 66,968 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 20th-largest county in Washington. Population density is 70 people per square mile.
The population of Mason County has grown 14.7% since 2010 (60,733 → 69,632), a +0.98% annualized rate.
The median household income in Mason County, Washington is $78,359, with mean (average) household income of $97,813 and per-capita income of $38,685. 7.7% of residents live below the federal poverty level.
In Mason County, the largest racial and ethnic groups are White (78.3%), Hispanic or Latino (6.6%), Black or African American (1.0%). Figures are from the US Census Bureau's 2023 ACS 5-year estimates and reflect self-reported responses.
The median age in Mason County, Washington is 44.8 years. Residents are 47.9% female and 52.1% male.
The median home value in Mason County is $377,400 and median monthly rent is $1,205. 81.1% of occupied housing units are owner-occupied. The county has 33,751 total housing units, 24.8% of which are vacant.
The largest employment sector in Mason County, Washington is professional, scientific, and management services, employing 19.6% of workers. The unemployment rate is 3.3%.
Seattle is among the largest cities associated with Mason County, Washington, with a population of 741,440.
Mason County, WA Climate
Mason County, WA has an average annual temperature of 9.7°C (49°F) and receives about 1783 mm of precipitation per year. The warmest month is August and the coldest is January. Figures are 1970–2000 climate normals.
9.7°C
Avg Temp
1783
Precip (mm/yr)
Aug
Hottest Month
Jan
Coldest Month
| Month | Avg (°C/°F) | Precip |
|---|---|---|
| January | 4° / 38° | 269 mm |
| February | 5° / 41° | 214 mm |
| March | 7° / 44° | 195 mm |
| April | 8° / 47° | 119 mm |
| May | 11° / 53° | 76 mm |
| June | 14° / 57° | 53 mm |
| July | 16° / 61° | 32 mm |
| August | 17° / 62° | 39 mm |
| September | 14° / 58° | 71 mm |
| October | 10° / 51° | 152 mm |
| November | 6° / 44° | 267 mm |
| December | 4° / 39° | 296 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 Mason County, WA
The most comfortable months to visit Mason County, WA are typically August, July and June, when temperatures are mildest and rainfall is relatively low. The hottest month is August (around 24°C high). The coldest is January (near 1°C low). December is usually the wettest month.
Where to stay near Mason County
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Top-rated places to stay near Mason County
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Data from the American Community Survey (ACS) 5-Year estimates.
Source: U.S. Census Bureau ACS, 2026.