Cook County, IL → Marin County, CA

Reported tax-filing households, individuals, and adjusted gross income that moved from Cook County, IL to Marin County, CA, 2022–2023.

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.”