In 8,262 American neighborhoods, the car isn't a given. Most site models assume it is.

Almost every site-selection convention in American retail — the drive-time radius, the parking ratio, the drive-thru stack, the traffic count itself — carries a silent assumption: the customer has a car.

In the median American neighborhood, that assumption is nearly perfect. Just 4.9% of households are carless; the other 95% are motorized, and the standard playbook describes them well.

But we counted the other America: 8,262 census tracts — one neighborhood in ten — where at least 20% of households have no vehicle at all. Source: IQ Locations analysis of 2024 ACS 5-year data.

Where the line falls

The carless tracts are not a light version of the car tracts — they're a different geography with different physics, and they concentrate in two distinct flavors. The big-city version: transit-dense urban cores (the same Bronx and Brooklyn that top our super-commuter list — long commutes and no car is the transit signature). And the overlooked version: lower-income small-town and rural tracts where carlessness isn't a lifestyle choice, it's a constraint — no transit as an alternative, just a smaller world.

Those two flavors share a statistic and almost nothing else, which is why the rest of the tract profile — income, density, transit mode share — has to disambiguate what a 25% carless number means before any site decision uses it.

What breaks at the line

Cross into a high-carless tract, and the standard toolkit inverts. The trade radius collapses from drive-time to walk-time: a customer without a car lives a quarter-mile from your door or is not your customer. Traffic counts stop measuring customers and start measuring people passing through a neighborhood they don't shop in. Parking stops being an amenity and starts being dead rent. And weekly-stock-up formats give way to high-frequency small-basket ones — the carless household shops more often and carries less, which is why the corner format beat the superstore in these tracts a century before anyone called it a strategy.

The failure runs in both directions, as usual. A drive-thru concept underwritten on the traffic count in a 30%-carless tract has priced in customers who can't join the line. And a walk-in format that thrives on carless density expands to a 95%-motorized suburb and discovers its whole convenience advantage evaporates at the parking-lot line.

The carless share for any address — plus the density, transit, and income context that tells you which flavor you're looking at — is neighborhood-level public data, on every report we run. It's the fastest single check on whether a format's core assumption survives contact with the block. Thirty seconds. Cheaper than the parking lot.