Demographics of Mason County, Washington

Mason County, Washington had 71,165 people on July 1, 2025, by the Census Bureau’s estimate: +5,124 since July 2020. Age, income, poverty, housing and origin below come from the American Community Survey, averaged over 2020–2024, each with its margin of error.

Mason County, in four figures

71,165
Population: July 1, 2025, Vintage 2025 estimate.; +7.8%
Change since July 2020: +5,124 people.; 44.7 ±0.4
Median age: ACS 2020–⁠2024.; $83,270 ±$4,720
Median household income: ACS 2020–⁠2024, in 2024 dollars.

Population, year by year

July 1 estimates from the Census Bureau’s Vintage 2025. Each year's change is births less deaths, net moves from abroad and net moves from elsewhere in the country, with the Bureau's small residual. The 2020 row's components run 3 months, from the April census to July 1.

Mason County, Washington's population grew 7.8% from July 2020 to July 2025, against +3.1% nationally

The July 1 estimate of Mason County, Washington's resident population and the nation's, each year of the Census Bureau's Vintage 2025, as a share of its July 2020 level (= 100).

U.S. Census Bureau — Census Bureau population estimates — counties and Puerto Rico municipios, with components of change

About this chart

The figures

Mason County, Washington's population grew 7.8% from July 2020 to July 2025, against +3.1% nationally. The July 1 estimate of Mason County, Washington's resident population and the nation's, each year of the Census Bureau's Vintage 2025, as a share of its July 2020 level (= 100).
July 1	Population	Index	United States
2020	66,041	100.0	100.0
2021	67,271	101.9	100.2
2022	68,244	103.3	100.7
2023	68,768	104.1	101.6
2024	69,759	105.6	102.5
2025	71,165	107.8	103.1

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Population of Mason County, Washington on July 1 of each year, Vintage 2025
July 1	Population	Change	Births less deaths	From abroad	From elsewhere in the country
2020	66,041	+320	−25	0	+385
2021	67,271	+1,230	−153	+67	+1,364
2022	68,244	+973	−211	+214	+921
2023	68,768	+524	−183	+326	+383
2024	69,759	+991	−183	+519	+655
2025	71,165	+1,406	−183	+225	+1,384

Age, 2020–2024

The median age is 44.7 ±0.4: for men 43.2 ±0.4 and for women 46.2 ±0.5. Shares are of everyone the survey counts, in the Bureau’s sex-by-age table (B01001).

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People in Mason County by age, ACS 2020–2024
Age	People	Share	Washington	United States
Under 5	3,500 ±102	5.1% ±0.2	5.5% ±<0.1	5.6% ±<0.1
5 to 17	9,773 ±537	14.4% ±0.8	15.8% ±0.1	16.3% ±<0.1
18 to 24	4,517 ±383	6.6% ±0.6	8.5% ±0.1	9.1% ±<0.1
25 to 44	16,376 ±592	24.1% ±0.9	29.5% ±0.1	26.9% ±<0.1
45 to 64	17,348 ±668	25.5% ±1.0	24.0% ±0.1	24.8% ±<0.1
65 and over	16,468 ±823	24.2% ±1.2	16.6% ±0.1	17.2% ±<0.1

Income and poverty, 2020–2024

Median household income is $83,270 ±$4,720, and income per person $39,551 ±$1,425, in 2024 dollars. The median is $98,141 ±$414 in Washington and $80,734 ±$166 in the United States.

Households by income

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Households in Mason County by income, ACS 2020–2024
Household income	Households	Share	Washington	United States
Under $25,000	3,517 ±426	13.5% ±1.6	11.1% ±0.2	14.6% ±<0.1
$25,000 to $49,999	3,500 ±457	13.4% ±1.7	13.2% ±0.2	16.7% ±<0.1
$50,000 to $74,999	4,758 ±563	18.3% ±2.1	14.1% ±0.2	15.5% ±<0.1
$75,000 to $99,999	3,672 ±387	14.1% ±1.4	12.4% ±0.1	12.6% ±<0.1
$100,000 to $149,999	5,168 ±530	19.9% ±2.0	19.2% ±0.2	17.5% ±<0.1
$150,000 to $199,999	2,802 ±417	10.8% ±1.6	11.4% ±0.1	9.6% ±<0.1
$200,000 or more	2,612 ±432	10.0% ±1.6	18.5% ±0.2	13.4% ±0.1

Poverty by age

The poverty rate is the share of people whose family income is below the federal threshold for their family’s size, of everyone for whom the Bureau determines it (B17020).

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Poverty rate in Mason County by age, ACS 2020–2024
Age	Below poverty	Rate	Washington	United States
All ages	8,104 ±971	12.3% ±1.5	9.9% ±0.2	12.5% ±0.1
Under 18	1,796 ±461	14.0% ±3.5	11.6% ±0.3	16.1% ±0.1
18 to 59	3,948 ±533	12.5% ±1.7	9.5% ±0.2	11.6% ±0.1
60 and over	2,360 ±363	10.9% ±1.6	9.3% ±0.2	11.0% ±<0.1

Housing, 2020–2024

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Housing in Mason County, ACS 2020–2024
Measure	Mason County	Washington	United States
Housing units	34,152 ±49	3,306,620 ±517	143,775,355 ±10,234
Occupied	76.2% ±1.8	92.7% ±0.2	89.9% ±0.1
Vacant	23.8% ±1.8	7.3% ±0.2	10.1% ±0.1
Owner occupied	82.3% ±2.0	63.8% ±0.3	65.2% ±0.3
Renter occupied	17.7% ±2.1	36.2% ±0.2	34.8% ±0.1
Median home value	$411,800 ±$13,841	$564,600 ±$1,940	$332,700 ±$236
Median gross rent	$1,285 ±$99	$1,760 ±$7	$1,413 ±$2
Median year built	1989 ±2	1985 ±1	1980 ±1

Occupied and vacant are shares of all housing units; owner and renter occupied are shares of occupied units. Value and rent are medians in 2024 dollars.

Origin and place of birth, 2020–2024

Hispanic or Latino origin is not a race in the Census Bureau’s tables. Here the people of Hispanic origin, of any race, are one row, and everyone else is counted by race alone (B03002), so the rows add to the whole.

Hispanic origin and race

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People in Mason County by Hispanic origin and race, ACS 2020–2024
Origin	People	Share	Washington	United States
Hispanic or Latino	8,685 ±0	12.8% ±<0.1	14.4% ±<0.1	19.3% ±<0.1
White alone, not Hispanic	50,945 ±487	74.9% ±0.7	63.1% ±0.1	57.4% ±<0.1
Black alone, not Hispanic	690 ±103	1.0% ±0.2	3.8% ±0.1	11.9% ±<0.1
Asian alone, not Hispanic	650 ±171	1.0% ±0.3	9.7% ±0.1	5.9% ±<0.1
American Indian and Alaska Native alone, not Hispanic	971 ±286	1.4% ±0.4	0.8% ±<0.1	0.5% ±<0.1
Native Hawaiian and Other Pacific Islander alone, not Hispanic	29 to 193	< 0.1% to 0.3%	0.7% ±<0.1	0.2% ±<0.1
Some other race alone, not Hispanic	280 to 1,154	0.4% to 1.7%	0.6% ±<0.1	0.6% ±<0.1
Two or more races, not Hispanic	5,213 ±507	7.7% ±0.7	6.8% ±0.1	4.3% ±<0.1

A range (the estimate less and plus its margin) where the Bureau's estimate is too uncertain to state as one number: a coefficient of variation over 30%.

Place of birth and citizenship

“Born a citizen outside the states” counts people born in Puerto Rico, the island areas, or abroad to American parents. Naturalized citizens and those who are not citizens together make up the people born abroad (B05002).

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People in Mason County by place of birth and citizenship, ACS 2020–2024
Born	People	Share	Washington	United States
Born in the state	37,212 ±1,287	54.7% ±1.9	46.4% ±0.2	57.3% ±<0.1
Born in another state	25,083 ±1,125	36.9% ±1.7	36.2% ±0.2	26.9% ±<0.1
Born a citizen outside the states	959 ±244	1.4% ±0.4	1.9% ±<0.1	1.7% ±<0.1
Born abroad	4,728 ±564	7.0% ±0.8	15.4% ±0.1	14.1% ±<0.1
Naturalized citizens	1,694 ±349	2.5% ±0.5	7.5% ±0.1	7.4% ±<0.1
Not citizens	3,034 ±462	4.5% ±0.7	7.9% ±0.1	6.8% ±<0.1

Mason County among the counties of Washington

20th of 39 by population, July 2025. Every one is listed on the Washington page.

Counties of Washington near Mason County in population, July 2025
County	July 2025	Change since 2020
Lewis County	88,062	+6.7%
Island County	85,657	−1.5%
Chelan County	81,941	+3.3%
Clallam County	78,202	+1.1%
Grays Harbor County	78,144	+3.0%
Mason County	71,165	+7.8%
Walla Walla County	62,361	−0.4%
Stevens County	49,668	+6.6%
Kittitas County	48,803	+4.2%
Whitman County	48,512	+1.5%
Douglas County	46,473	+8.0%

Elsewhere on the site

Sources

Census Bureau population estimates — counties and Puerto Rico municipios, with components of change — U.S. Census Bureau · U.S. Government work · retrieved September 25, 2026
American Community Survey 5-year estimates — table-based Summary File · U.S. Government work

Data retrieved September 25, 2026