Nearly half of America's counties are shrinking. The growth went to about twenty places.

The phrase "growing market" implies growth is the American default — that population expands everywhere and site selection is about picking how much growth to ride.

The county data says otherwise. We compared every U.S. county's population between the 2019 and 2024 ACS five-year windows: 1,462 of 3,211 counties — 45.5% — lost population. Nearly half the country's counties are shrinking while the national total grows. Growth isn't a tide anymore. It's a relocation.

Where it went

Among counties over 100,000 people, the leaders:

Source: IQ Locations analysis of ACS 5-year county series.

Six of the top eight are Texas; all eight are the next ring out from a major metro — not the core county, the one beyond it, where the land was. (Comal County regulars will recognize New Braunfels from our June teardown; the growth is exactly why every listing there leads with the same brochure sentence.)

Now put this next to the affordability map from August and the pattern closes: the shrinking counties are overwhelmingly rural and Rust Belt, and the exploding ones are the affordable fringes of Sun Belt metros — the under-4x price-to-income rings absorbing everyone priced out of the 5x-and-worse states. People are moving from where houses are cheap but jobs are thin, and from where jobs are rich but houses are 8x income, to the narrow band where both lines cross.

Reading growth like an analyst

Three implications for anyone siting into this map. First, in a 39%-growth county, every dataset is a floor — the ACS five-year average lags the rooftops (our data-vintage piece covered why), so the real trade-area population in Kaufman County is higher than any report shows, and permits are the tiebreaker. Second, retail supply lags demand in these places by years — the classic fringe-growth play is arriving after the rooftops but before the retail catches up, and establishment counts against population growth measure exactly that gap. Third, in the shrinking half of the map, the site question inverts: not "how much growth do I capture" but "does the remaining base support one operator comfortably" — shrinking-county monopolies are quietly some of the steadiest small businesses in America.

Which of those three games a specific address is playing depends on its county, its tract, and its five-year trajectory — all public, all on a 30-second report. "Growing market" is a claim. The growth rate is a number. We'd bet the lease on the number.