San Mateo County, CA → King County, WA
Reported tax-filing households, individuals, and adjusted gross income that moved from San Mateo County, CA to King County, WA, 2022–2023.
Households moved
397
People moved
556
Reported AGI moved
$76.85M
Avg. AGI per migrating return
$193,579
Avg. household size
1.40
Reported county-pair flows
1
IRS migration data does not represent every U.S. resident (non-filers are underrepresented), a mailing address does not always equal a physical residence, and AGI reflects Year 2 tax returns without proving income was earned after arrival. Use “income moved” or “reported AGI moved,” not “economic impact created.”