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One finding at a time, with the caveat that belongs next to it. Every number comes from the same public Census and ACS data as the ZIP reports.

The most concentrated business ZIP codes in America

Per person present, the top 20 are dominated by apparel clusters. What the ranking shows, and what it does not.

BizGapMap — free, no-login small-business saturation reports for major U.S. counties. Built entirely from public U.S. Census, BLS, and IRS data (ZBP 2023, ACS 2024 5-year, PEP 2024, LODES, QCEW, IRS SOI). No forecasts, no revenue guesses — withheld cells are marked, and the few derived counts are labelled as estimates.