Migration: IRS Statistics of Income, Individual Income Tax Migration Data, county-to-county, filing years 2022 to 2023. A federal publication with no licence restriction stated.
ZIP codes: IRS Statistics of Income, Individual Income Tax Statistics by ZIP code, tax year 2022 (6 income classes, top class $200,000 or more).
Place names: GeoNames postal code data, CC BY 4.0.
Limits: ZIP and county data stop at the $200,000 class, so no county or ZIP top 1% can be measured. Net worth by place does not exist in federal data.
Vintages differ: ZIP data is tax year 2022, migration is 2022 to 2023.