IRS Statistics of Income county-to-county migration: inflows, outflows, and net migration of tax returns (~households), people, and adjusted gross income between every US county pair, filing years 2022→2023. Per county: net migration plus its top origin and destination counties. 180,406 flow cells across 3,120 counties. Aggregate (IRS suppresses small flows) — zero PII. The flow layer over the county place-economics cluster (joins FHFA HPI, IRS income, HUD rents, NASS ag, building permits by FIPS). Top net gainers 2022-23: Polk & Pasco FL, Montgomery & Williamson TX; top losers: Los Angeles, Miami-Dade, Queens, Bronx. Canonical /migration/{state_fips}-{county_fips} page per county.
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