Contra Costa County, CA → San Mateo County, CA
Reported tax-filing households, individuals, and adjusted gross income that moved from Contra Costa County, CA to San Mateo County, CA, 2022–2023.
Households moved
839
People moved
1,317
Reported AGI moved
$100.95M
Avg. AGI per migrating return
$120,325
Avg. household size
1.57
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.”