According to the U.S. Census Bureau's Vintage 2025 population estimates, Texas added 391,243 residents, the largest numeric gain of any state, yet Austin posted rent declines through the same period and Phoenix posted one of the highest concession penetration rates in the country. Population growth and rent growth are not the same number. This four-step framework shows you how to pair migration data with supply absorption so you score a market correctly before you commit time to a pro forma.
Population Growth Headlines Hide the Real Risk in 2026
Every operator reads the same headline data. The Census Bureau's Vintage 2025 estimates show South Carolina growing fastest among all states at 1.5%, followed by Idaho at 1.4% and North Carolina at 1.3%. In absolute numbers, Texas led the nation with 391,243 new residents, followed by Florida at 196,680 and North Carolina at 145,907. U-Haul's growth index, a separate proprietary measure built from one-way truck rental volume rather than Census counts, ranked Ocala, Florida as its top growth city for the third time in four years.
Read this data on its own and you would buy in Florida and Texas without hesitation. But Austin and Phoenix sit inside the same Sun Belt growth story and both markets posted rent softness through 2025 into 2026. Phoenix has run among the highest concession penetration rates in the country, per Apartment List data. The reason: population growth measures demand. It says nothing about supply. When a fast-growing market also delivers units faster than households form, rents fall even as the population count rises.
One more wrinkle worth tracking: the Census Bureau attributes most of the 2026 national growth slowdown to a drop in net international migration, down from 2.7 million to 1.3 million year-over-year, not to a reversal in domestic relocation patterns. Redfin's migration data shows a related shift on the domestic side: long-distance relocation searches ticked up to nearly one in five house hunters in late 2025, while inflows to Florida and Texas metros specifically decelerated as housing costs and natural disaster risk weighed on demand. Headline state growth numbers sometimes mask a metro-level deceleration already underway.
The operators who get burned in 2026 are the ones who stop their market research at the migration headline. The operators who win pair migration data with a supply check before they screen a single deal.
Step 1: Pull In-Migration Data at the County Level, Not the State Level
State-level migration totals mask wide variation within the state. Texas gained 391,243 residents statewide, but Census Bureau county-level data shows growth concentrating in specific suburban counties, not spreading evenly across every metro. Kaufman County and Rockwall County, both near Dallas, posted the nation's highest domestic migration rates from 2021 to 2023 according to Census Bureau analysis. Georgia's Dawson and Jackson counties, north of Atlanta, led in 2024. South Carolina's Jasper County led in 2025.
Pull your migration data from the Census Bureau's county-level domestic migration series, not a statewide press release. The county data shows you where inside a metro the growth lands, and this matters because supply pipelines also concentrate in specific submarkets. A county with a strong recent in-migration ranking and a thin supply pipeline is a different opportunity than a county with average in-migration and 8,000 units under construction.
Also check the loss side. Several large gateway metros, including San Francisco and Denver, have shown improvement on net domestic migration after years of outflow, per recent reporting on Census data. A market losing residents is not automatically a market to avoid. A market on the edge of a reversal, with supply already pulled back, deserves a second look.
Step 2: Calculate Your Migration-to-Supply Ratio
Migration data and supply data answer two different questions. Migration tells you how many new households are forming demand in a market. Supply tells you how many new units compete for this demand. This framework divides one by the other to produce a single number showing whether a market is tightening or loosening. Treat it as a screening tool you build yourself, not a number any data provider publishes directly.
Migration-to-Supply Ratio = Net Annual In-Migration (households) / New Units Delivered (annual)Convert population in-migration to households by dividing by your market's average household size, typically 2.2 to 2.6 people per household in most U.S. metros. Example: a metro adds 30,000 residents in net in-migration, equal to roughly 12,500 new households at 2.4 people per household. The same metro delivers 18,000 new units this year, per CoStar or Yardi Matrix supply tracking. Your ratio is 12,500 divided by 18,000, or 0.69. Supply is outrunning demand by a wide margin. Expect rent pressure and rising concessions regardless of the population growth headline.
Run the same calculation on a Midwest metro adding 8,000 net new households against 3,000 new units delivered. The ratio is 2.67. Demand outpaces supply by nearly three to one. This is the dynamic behind stronger Midwest rent performance in several cities in 2026 even where total population gains run smaller in absolute terms than the Sun Belt.
Treat a ratio above 1.5 as a signal a market is tightening faster than it builds, and a ratio below 1.0 as oversupply risk, regardless of how strong the in-migration number looks in isolation. Calculate this ratio for every market on your shortlist before you rank them.
Step 3: Read Search-Interest and Permit Data as Leading Indicators
Migration counts and delivery counts both look backward. Search-interest data and permit data give you a forward look at where the next wave of demand and supply is heading. Treat both as directional, not exact, since search-volume methodology differs by provider and is not standardized across sources.
On the demand side, moving-search platforms track inbound search volume by metro. One such tracker, cited by relocation-services firm Evernest, showed Wisconsin posting a 79% increase in inbound move searches and Minnesota jumping from the 40th most-searched relocation destination to 14th year-over-year, alongside Minneapolis and Indianapolis both shifting from net outflow to net inflow status. Search-interest jumps like these tend to show up in actual migration data with a lag of several quarters, giving you an early directional read before Census data confirms it.
On the supply side, building permit data shows you what is coming before it breaks ground. The Census Bureau's Building Permits Survey tracks multifamily permits down to the metro and place level. Evernest's reporting cites a sharp year-over-year jump in Des Moines permits and a top-five national ranking for Columbus on multifamily permits issued in 2025. Treat any single-metro percentage spike with caution, since small-base metros often post large percentage swings off a low starting number, and verify the underlying count against the Census BPS data before sizing a thesis around it. A sustained spike in permits today becomes a spike in deliveries in 18 to 24 months. If a market shows rising search interest and a permit spike at the same time, the ratio you calculated in Step 2 will shift. Run the math again with the permitted pipeline added to current construction, not current construction alone.
- Rising search interest, low permit growth: The strongest setup. Demand is building and supply has not responded yet.
- Rising search interest, rising permits: Watch the timing. If permits convert to deliveries before the demand wave peaks, the market tightens first and loosens later. Time your acquisition and hold period around this sequence.
- Flat search interest, rising permits: The setup behind several of today's distressed Sun Belt submarkets. Supply is responding to a demand signal already fading.
Step 4: Compare Rent Growth Against the Migration-to-Supply Ratio, Not Against Population Growth
The final check confirms whether the ratio you calculated is showing up in actual rents yet. If it is not, you are either early or your data is wrong.
In the South, where regional population growth has outpaced every other region, with Orlando, Houston, and Raleigh among the fastest-growing large metros per Cushman & Wakefield's analysis of Census data, rent growth in the oversupplied submarkets of Austin and Phoenix still runs negative to flat. The migration-to-supply ratio in those specific submarkets sits well below 1.0 despite a strong regional population growth rate.
In the Midwest, where Cushman & Wakefield's analysis shows the slowest regional population growth in the country, rent growth in several cities has outpaced the Sun Belt. Evernest cites year-over-year rent gains in Cleveland, Chicago, Kansas City, and Detroit during this period, all markets with comparatively thin supply pipelines. Low population growth paired with an even lower supply growth rate produces stronger rent performance than high population growth paired with high supply growth.
This is the central lesson of the framework. Rent growth follows the ratio between demand and supply, not the population growth rate on its own. A market ranks near the bottom of the country on population growth and the top of the country on rent growth in the same year when the binding constraint was never demand. It was always supply.
How MultiVest Engine Handles This
MultiVest Engine's market research tool works at the property address level today. Enter an address and the platform generates a sourced market research report covering current rental rates by unit type, occupancy and vacancy trends, recent rent growth, typical cap rate ranges, and the local economic and population drivers behind the numbers, each backed by a citation list you check yourself before relying on it.
It does not yet compare multiple markets side by side or calculate a migration-to-supply ratio automatically. Run each address on your shortlist through the platform to get a sourced read on local rent, vacancy, and population trends, then bring in your own Census migration and CoStar or Yardi Matrix supply numbers to build the ratio described in Step 2. Once you have a market clearing the ratio test, MultiVest Engine's underwriting tools, including T-12 normalization and DSCR and cap rate analysis, take over for the deal-level math.
The Bottom Line
Migration data on its own ranks markets by where people are moving. It does not rank markets by where rents will grow. Pull migration data at the county level, convert it to a migration-to-supply ratio against new unit deliveries, check search-interest and permit data for the next 18 to 24 months, and confirm the ratio against actual rent trends before you commit. The fastest-growing population markets and the best-performing rent markets are not always the same markets in 2026, and the operators who confuse the two are the ones underwriting the wrong deal.
References
- U.S. Census Bureau: Population Growth Slows Due to Decline in Net International Migration — Vintage 2025 Population Estimates
- U.S. Census Bureau: Some Like It Hot — County Domestic Migration Trends From 2011 to 2025
- Cushman & Wakefield: Breaking Down the Latest Census Data — Sunbelt vs. Gateway City Growth
- Redfin: Housing Migration News — Long-Distance Moves and Metro-Level Relocation Trends
- Evernest: How Migration Patterns Are Reshaping Midwest Multifamily Demand
- KNSI Radio: Where Americans Are Moving in 2026 — The Cities Gaining and Losing the Most Residents (Census, U-Haul, and Redfin data)
- U.S. Census Bureau: Building Permits Survey