Mason County's 2026 population is estimated at 72,571, reflecting a 1.98% growth rate over the past year (World Population Review estimate based on U.S. Census Bureau data). Mason County is the 20th largest county in Washington. The 2010 population was 60,733 and has grown 19.49% since 2010.
Overall: 44.7 years
Female: 46.2 years
Male: 43.2 years
There are 54,709 adults, (16,468 of whom are seniors) in Mason County.
Female: 32,665 (48%)
Male: 35,317 (52%)
The racial composition of Mason County includes 76.99% White, 7.31% other race, and smaller percentages for Native American, Black or African American, Asian, Native Hawaiian or Pacific Islander and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| White | 52,340 | 76.99% |
| Two or more races | 7,594 | 11.17% |
| Other race | 4,968 | 7.31% |
| Native American | 1,578 | 2.32% |
| Black or African American | 709 | 1.04% |
| Asian | 665 | 0.98% |
| Native Hawaiian or Pacific Islander | 128 | 0.19% |
Mason County 's average per capita income is $54,756. Household income levels show a median of $83,270. The poverty rate stands at 12.26%.
| Name | Median ↓ | Mean |
|---|---|---|
| Married Families | $109,514 | - |
| Families | $99,838 | $115,582 |
| Households | $83,270 | $100,630 |
| Non Families | $47,444 | $63,517 |
Average Income
Median Household Income
Poverty Rate