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
Mason County is a county in Washington with a population of 66,968. It ranks #20 among counties in Washington by population. The median age is 44.8, older than the national median. The population is 52.1% male and 47.9% female.
The median household income in Mason County is $78,359, above the US median of $74,580. 7.7% of residents live below the federal poverty level. Home values sit at a median of $377,400, with monthly rent averaging $1,205. The homeownership rate of 81.1% is higher than the national rate of 64.8%.
Educational attainment in Mason County reflects 22.0% of adults 25 and older holding a bachelor's degree or higher, below the national average of 34.3%. Roughly 11.6% of workers primarily work from home, similar to the national work-from-home rate of 14.2%. The average commute is 36.4 minutes each way.
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.
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Statewide data for Washington
Population, race, income, age, and trends across Washington
Data from the American Community Survey (ACS) 5-Year estimates.
Source: U.S. Census Bureau ACS, 2026.