Market insights · Washington
Mason County, WA: growth, migration and housing
Mason County has 71,165 residents, up 7.8% since 2020 (+2.0% in the last year). In 2022–2023, 2,222 households moved in and 1,887 moved out (+335 net), bringing in a net $44.3M of income. Median household income is $83,270, the median home $411,800 and median rent $1,285 a month.
In Washington: 4th of 39 counties for 5-year population growth · 7th of 39 counties for net in-migration (per resident) · 13th of 39 counties for median household income · 18th of 39 counties for median home value.
Where new residents came from
Top counties by households (tax returns) moving to Mason County, 2022–2023 (IRS).
| From | Households (tax returns) | Their income (AGI) |
|---|---|---|
| Kitsap County, WA | 382 | $26.3M |
| Thurston County, WA | 366 | $24.2M |
| Pierce County, WA | 288 | $21.8M |
| King County, WA | 233 | $24.0M |
| Grays Harbor County, WA | 84 | $4.2M |
| Snohomish County, WA | 62 | $6.1M |
| Clark County, WA | 33 | $3.6M |
| Multnomah County, OR | 27 | $2.1M |
Where leavers went
Top counties by households leaving Mason County, 2022–2023 (IRS).
| To | Households (tax returns) | Their income (AGI) |
|---|---|---|
| Thurston County, WA | 361 | $19.2M |
| Kitsap County, WA | 281 | $18.3M |
| Pierce County, WA | 194 | $15.4M |
| King County, WA | 114 | $9.6M |
| Grays Harbor County, WA | 74 | $3.9M |
| Snohomish County, WA | 42 | $2.4M |
| Lewis County, WA | 36 | $2.2M |
| Maricopa County, AZ | 34 | $3.9M |
BizyFi in Mason County
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Sources: U.S. Census Bureau population estimates (vintage 2025), American Community Survey 5-year (2024), and IRS Statistics of Income county-to-county migration data (2022–2023). Migration counts are tax returns (roughly households) moving between U.S. counties; the IRS suppresses very small flows. Growth rates, per-1,000 figures, rent share and state ranks are BizyFi calculations. Data updated 2026-10-17. This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.