Market insights · Idaho
Washington County, ID: growth, migration and housing
Washington County has 11,583 residents, up 9.7% since 2020 (+0.8% in the last year). In 2022–2023, 315 households moved in and 321 moved out (-6 net), bringing in a net $6.1M of income. Median household income is $54,000, the median home $278,100 and median rent $938 a month.
In Idaho: 13th of 44 counties for 5-year population growth · 30th of 43 counties for net in-migration (per resident) · 41st of 44 counties for median household income · 31st of 44 counties for median home value.
Where new residents came from
Top counties by households (tax returns) moving to Washington County, 2022–2023 (IRS).
| From | Households (tax returns) | Their income (AGI) |
|---|---|---|
| Ada County, ID | 53 | $5.0M |
| Payette County, ID | 40 | $1.6M |
| Canyon County, ID | 30 | $2.2M |
Where leavers went
Top counties by households leaving Washington County, 2022–2023 (IRS).
| To | Households (tax returns) | Their income (AGI) |
|---|---|---|
| Ada County, ID | 53 | $2.1M |
| Payette County, ID | 49 | $2.0M |
| Canyon County, ID | 47 | $2.2M |
| Malheur County, OR | 27 | $1.3M |
BizyFi in Washington 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.