Market insights · Washington
Lewis County, WA: growth, migration and housing
Lewis County has 88,062 residents, up 6.7% since 2020 (+1.1% in the last year). In 2022–2023, 2,437 households moved in and 2,086 moved out (+351 net), bringing in a net $49.3M of income. Median household income is $74,796, the median home $385,800 and median rent $1,097 a month.
In Washington: 8th of 39 counties for 5-year population growth · 9th of 39 counties for net in-migration (per resident) · 19th of 39 counties for median household income · 24th of 39 counties for median home value.
Where new residents came from
Top counties by households (tax returns) moving to Lewis County, 2022–2023 (IRS).
| From | Households (tax returns) | Their income (AGI) |
|---|---|---|
| Thurston County, WA | 558 | $39.1M |
| Pierce County, WA | 301 | $19.5M |
| Cowlitz County, WA | 171 | $13.6M |
| King County, WA | 150 | $11.5M |
| Clark County, WA | 135 | $9.9M |
| Grays Harbor County, WA | 68 | $3.8M |
| Snohomish County, WA | 43 | $2.4M |
| Multnomah County, OR | 41 | $4.2M |
Where leavers went
Top counties by households leaving Lewis County, 2022–2023 (IRS).
| To | Households (tax returns) | Their income (AGI) |
|---|---|---|
| Thurston County, WA | 483 | $24.9M |
| Pierce County, WA | 168 | $8.8M |
| Cowlitz County, WA | 134 | $7.1M |
| King County, WA | 122 | $6.1M |
| Grays Harbor County, WA | 78 | $3.9M |
| Clark County, WA | 68 | $3.3M |
| Spokane County, WA | 35 | $1.3M |
| Snohomish County, WA | 32 | $2.0M |
BizyFi in Lewis 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.