Market insights · Washington
King County, WA: growth, migration and housing
King County has 2,344,939 residents, up 3.1% since 2020 (+1.2% in the last year). In 2022–2023, 66,131 households moved in and 66,293 moved out (-162 net), while a net $1.96B of income left. Median household income is $124,746, the median home $859,900 and median rent $2,092 a month.
In Washington: 27th of 39 counties for 5-year population growth · 33rd of 39 counties for net in-migration (per resident) · 1st of 39 counties for median household income · 1st of 39 counties for median home value.
Where new residents came from
Top counties by households (tax returns) moving to King County, 2022–2023 (IRS).
| From | Households (tax returns) | Their income (AGI) |
|---|---|---|
| Snohomish County, WA | 7,334 | $710.3M |
| Pierce County, WA | 6,086 | $415.8M |
| Los Angeles County, CA | 2,363 | $289.2M |
| Santa Clara County, CA | 1,462 | $342.0M |
| Maricopa County, AZ | 1,322 | $151.0M |
| San Diego County, CA | 1,128 | $109.7M |
| Kitsap County, WA | 960 | $93.9M |
| Cook County, IL | 954 | $120.7M |
Where leavers went
Top counties by households leaving King County, 2022–2023 (IRS).
| To | Households (tax returns) | Their income (AGI) |
|---|---|---|
| Snohomish County, WA | 10,534 | $1347.5M |
| Pierce County, WA | 9,291 | $753.4M |
| Los Angeles County, CA | 1,799 | $229.0M |
| Maricopa County, AZ | 1,502 | $301.3M |
| Kitsap County, WA | 1,360 | $178.1M |
| Santa Clara County, CA | 1,214 | $271.7M |
| San Diego County, CA | 1,112 | $160.0M |
| Thurston County, WA | 1,085 | $93.5M |
BizyFi in King County
59 companies in the BizyFi directory are based here. Search them on the company map (company names with a free account), or browse Washington companies.
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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.