You've been watching cap rates tick up for three years and thinking: the SFR market is finally swinging back toward investors. ATTOM released its 2026 Single-Family Rental Market Report in March, and the headline number looked great — the national average SFR cap rate hit 7.3% in Q4 2025, up 194 basis points since 2021. If you stopped reading there, you'd feel good about the market. You shouldn't. Buried in the same report: rental yields actually fell in 54.8% of the 416 US counties studied. The "rising cap rate" story is real — but it's masking a deeply split market where half the country is compressing your returns and the other half is quietly paying 12% or better.

If you own investment property in Texas or the Sun Belt and you're thinking about your next acquisition, this is the analysis you need to run before you make an offer.

Here's what the county-level data actually shows — and what it means for cash flow at today's 6.51% mortgage rate.

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The headline number that's misleading you

The 7.3% national SFR cap rate sounds like good news. For context, in 2021 — at the peak of pandemic-driven bidding wars — average SFR cap rates had compressed to roughly 5.1%. The 194-basis-point recovery since then is real. What drove it? Mostly price growth slowing down, not rents surging. Home prices nationally have been rising at about 2.4% year-over-year (Redfin, April 2026) rather than the 15–20% pace of 2021–2022. That deceleration has mechanically improved yield calculations.

The problem is that "national average" hides extreme variation. ATTOM studied 416 counties with enough rental and sales data to analyze, and found that median home prices rose faster than median rents in 54% of those markets. That's the dynamic destroying yields: acquisition costs climbed while rent growth moderated. In 229 of the 416 counties, rents did outpace price growth — but those counties are clustered in specific, often overlooked markets. The national average blends the winning markets with the compressing ones and gives you a figure that doesn't describe either accurately.

The key number to hold in your head isn't 7.3%. It's 54.8% — the share of counties where your yield went the wrong direction last year.

Why yields are falling in the majority of markets

Start with the acquisition cost problem. The national median existing-home sale price hit $417,700 in April 2026 (NAR, April 2026) — an all-time high. In many Sun Belt markets, prices ran even harder during 2020–2023, then paused rather than corrected. Phoenix, Austin, Charlotte, and Tampa all saw massive price appreciation. Rents in those markets followed, but only to a point. By 2025–2026, rent growth had moderated significantly — Redfin tracks US median asking rents at roughly 1–2% annual growth nationally, down sharply from the 8–12% spikes of 2022. If you bought a Phoenix rental property in 2024, you paid near-peak prices. You didn't get near-peak rents to go with it.

The second compressing force is financing costs. At 6.51% (Freddie Mac PMMS, May 21, 2026), debt service is materially higher than anything investors modeled in 2020–2021. A $300,000 loan at 6.51% costs $1,899/month in principal and interest alone. At 3.0% — where rates sat in early 2021 — that same loan cost $1,265/month. That $634/month difference has to come out of your NOI. In markets where yields are already thin, it's the margin killer.

Put those two dynamics together — high purchase prices, high financing costs, moderate rent growth — and cash flow turns negative in the majority of US counties. The Sun Belt markets that drove investor interest from 2019–2023 are now the hardest places to make the numbers work.

The counties paying 12% or higher — and what they have in common

ATTOM's county-level data reveals the highest-yielding markets for 3-bedroom single-family rentals in 2026 (ATTOM, March 2026):

County State Gross yield (3-bed)
St. Clair County Illinois 14.5%
Mobile County Alabama 13.6%
Peoria County Illinois 12.5%
St. Louis County Minnesota 11.6%
Trumbull County Ohio 11.5%

Notice what's missing from that list: Florida. Texas. Arizona. California. The entire Sun Belt, which dominated investor attention for the past decade, doesn't appear anywhere near the top. The highest-yielding SFR markets in America right now are in the Midwest and Rust Belt — markets with entry prices often below $150,000, stable if not explosive rental demand, and no speculative price premium baked in.

St. Clair County, Illinois sits across the river from St. Louis, Missouri. It's not a glamorous market. It's not one that generates conference buzz. But at 14.5% gross yield, it's generating cash flow that most Sun Belt investors can only dream about. Indianapolis, the most-cited Midwest SFR market, is running around 9.1% gross yield — less dramatic than the top five but still well above the national average (ATTOM/Norada, 2026).

What these markets share: relatively low price-to-rent ratios. In St. Clair County, you might buy a 3-bedroom house for $120,000 that rents for $1,450/month. That's a 14.5% gross yield almost by definition. In Scottsdale, a $500,000 property rents for $2,400/month — a 5.8% gross yield before expenses. The math isn't subtle.

The risk these markets carry is real too: lower appreciation expectations, some with flat or declining populations, less liquidity when you want to exit. If your investment thesis requires meaningful price appreciation alongside cash flow, the Rust Belt is not the answer. But if you're running a cash-flow-first strategy — where the property pays you from day one — these are the counties delivering it right now.

The cash flow math at 6.51%

Gross yield is only the starting point. What matters for your actual finances is cash-on-cash return — what you pocket after mortgage payments, expenses, and vacancy. Here's how the math plays out at today's 6.51% rate in two contrasting scenarios.

Scenario A: High-yield Midwest market (St. Clair County, IL type)

Scenario B: National average market

This is the key insight: both properties are generating almost identical gross rent dollars. The difference is entirely in acquisition cost. The national-average property costs nearly twice as much to buy, but doesn't produce twice the rent. That gap — the gap between price and rent — is where cash flow goes to die.

At 6.51% financing, the break-even gross yield (where you generate zero monthly cash flow before income tax) is roughly 9.5–10% depending on your specific expense ratio. The national average of 7.45% doesn't clear that bar. The top 10% of counties — those hitting 12%+ — clear it with room to spare.

What this means if you're weighing your next property

The framing that most investors use — "are cap rates going up or down?" — is the wrong question for 2026. The right question is: which specific counties are producing cash-on-cash returns above the cost of my debt, and why?

The Sun Belt markets where you may already own property have likely seen yields compress. That doesn't make your existing properties bad investments — you bought at lower prices, and price appreciation has likely built equity. But using those same markets as the comparison point when evaluating a new acquisition is a mistake. The relative attractiveness of those markets has shifted.

If your goal is cash flow rather than appreciation, the data points toward Midwest and Rust Belt counties with gross yields above 10%. The names on that list — St. Clair County, Peoria, Trumbull — aren't sexy. But the cash-on-cash returns are. You'll want to look hard at local vacancy rates, population trends, and the employment base before committing. A 14.5% gross yield in a county losing 2% of its population every year is a different proposition than a 9% yield in a market that's holding steady.

The math points toward one conclusion: if cash flow is your primary criterion, you are looking in the wrong states. The highest-yielding SFR counties in America right now are not where the podcasts and conferences tell you to look. They're in the places nobody's talking about — and that's exactly why the yields are still there.