What Makes a Boom Town? Only 23 U.S. Counties Qualify

Everybody has a boom town. A friend swears their metro is exploding. A magazine crowns this year's "hottest" place to move. A builder points at a cornfield and calls it the next Austin. The word gets thrown at any county with one number pointing up.

So we tried to pin it down. Of the 1,001 largest U.S. counties we score, 626 of them — 63% — are running hot on at least one economic gauge right now. Hot on everything at once? That list collapses to 23. A real boom town, it turns out, is about a 2-in-100 thing.

One hot number is easy. Everything at once is rare.

A place can look like it's booming for a boring reason. Wages spike because one big employer handed out raises. Population climbs because a single subdivision opened. Jobs tick up off a pandemic hole. Any one of those makes a headline; none of them makes a boom town.

So we set a stricter bar. To even be in the conversation, a county has to land in the top 25% of all 1,001 on three genuinely different engines at the same time:

• Jobs — is the county actually adding payroll? (BLS QCEW employment growth)
• Paychecks — are wages climbing, not just headcount? (BLS QCEW wage growth)
• People — is the population genuinely growing? (Census population estimates)

Only 42 counties clear all three top-quartile bars together — jobs, paychecks, and people. That's already down from 626 to about 4% of the map. The other 584 have one or two cylinders firing, not the full engine.

Then we added a tie-breaker: is the growth actually pulling people in? Population can rise from births alone, so we kept only the counties that are also in the top quartile for net in-migration — people voting with a moving truck. (Migration and population growth overlap, so think of this less as a fourth independent test and more as proof the growth is the good kind: outsiders choosing to show up.) That final cut leaves 23 counties. Those are the real boom towns.

Meet the 23

They cluster where you'd half-expect — the exurban rings of fast-growing Sun Belt metros, plus a Carolina-Piedmont and mountain-west scatter. Texas alone lands five: Rockwall, Waller, Medina, Polk, and Brazos. Arizona's Pinal County (the Phoenix overflow valve) makes it, as do Florida's Osceola and Sumter, Colorado's Weld, Ohio's Delaware, Georgia's Barrow and Paulding, and a run of North Carolina counties — Pender, Harnett, Stanly.

One honest caveat before you pack a bag: these are the data's boom towns, and the data doesn't know why. Sumter County, Florida, is basically The Villages — a retirement megadevelopment. Its jobs and wages are growing because someone has to staff the clinics and restaurants for all those retirees, not because it's a young-professional magnet. A booming county isn't automatically your boom town. Look under the hood.

The good news for anyone worried this is a small-county mirage: it isn't. The 23 range from about 53,000 residents to 469,000, with a median near 113,000. These are real, mid-size suburban counties — not three-stoplight towns where a single new family swings the percentages.

Now the twist: booming ≠ a good place to buy

Here's where it gets interesting, and where our own scoreboard argues with the "boom town" label. The BoomTownIndex score isn't a measure of economic heat. It's a forecast — a machine-learning model (a gradient-boosted regressor trained on ~20 years of county data) that predicts how a county's home prices will grow relative to the national market. Job growth, wage growth, migration and the rest are inputs the model reads; the score that comes out is a home-price bet.

And on that bet, our 23 genuine boom towns are a coin flip. Ten of them land in the bottom half of the forecast — a BTI under 50, meaning the model expects them to appreciate slower than the typical county. A few of the hottest economies rank near the very bottom: affluent Dallas exurb Rockwall scores a 4, Columbus's high-income Delaware County a 5.

Why would a place with more jobs, higher pay, and a stream of new arrivals get a mediocre price forecast? The model doesn't hand us a single reason — that's the honest answer with an ensemble this complex. But a pattern is hard to miss: the deep underperformers skew toward already-expensive, high-income exurbs (Delaware County's median household income tops $133,000; Rockwall's is near $128,000), and several are cooling off a recent run, with home values slightly down over the past year even as the population climbs. When a county is already pricey and just took a breather, a hot job market isn't enough to promise market-beating gains. It's the same tension we dig into in the housing P/E ratio: growth you can already see is often growth you're already paying for.

If you're the one actually moving

Don't over-read that BTI number. A score below 50 means "expected to trail the national pace," not "prices are about to fall." For someone buying a home to live in — not to flip — a booming local economy is a genuinely great backdrop: you're moving somewhere with jobs to switch between, wages that rise, and neighbors arriving rather than leaving. That's the part a boom town gets right.

Just don't let the economic boom trick you into expecting your house to be a rocket. The two questions — "is this a great place to build a life?" and "will my home outrun the market?" — have different answers more often than the listicles admit. The strongest job market and the strongest price forecast rarely live in the same county, which is exactly why we score the two things separately.

Want to see how any single county stacks up on both the economy and the price forecast? Start with the fastest-growing counties, sanity-check the trade-offs on the safest counties list (fast and safe rarely overlap either), and read how to read a Boom Town score before you trust any ranking — ours included. Full model details live on our methodology page.

FAQ

Why only 1,001 counties and not all 3,100+?

We score the 1,001 most-populous U.S. counties, which together hold the large majority of Americans and nearly all relocation demand. Tiny rural counties are excluded partly because their percentages swing wildly on a handful of movers — the very distortion we wanted to keep out of this list.

Is a low BoomTownIndex score a reason not to move somewhere?

No. The score forecasts home-price growth versus the national market, not quality of life, safety, or affordability. A booming county with a below-median score can still be a smart place to live — you're just less likely to see your home outperform the broader market there.

Could a county drop off this list next year?

Easily. The three engines are measured on rolling government data, and exurban booms cool fast once the buildout slows. That's the point of updating it: a boom town is a moment, not a permanent title. We flag several early warning signs in the migration mirage.