Introduction
The 2020–2025 window produced the most significant county-level population redistribution in the United States in decades. The pandemic accelerated shifts that were already underway — out of dense coastal metros, into the Sun Belt, and from urban cores to suburban and exurban counties.
"What we are watching is not a temporary reshuffling. The 2020–2025 data shows a structural reset in where Americans choose to live, and the housing markets that catch the flow will outperform for a decade." — Brookings Institution demographer
National Overview
The U.S. population grew by roughly 0.5% per year between 2020 and 2025 (U.S. Census Bureau, 2025), the slowest sustained pace in a century. But the national average hides enormous county-level dispersion:
- Roughly 53% of counties gained population; 47% lost population (U.S. Census Bureau, 2025).
- The fastest-growing counties expanded at more than 5% per year, while the fastest-shrinking counties lost more than 2% per year.
- Net domestic migration favored the Sun Belt and the Mountain West at the expense of the Northeast and coastal California.
Top 10 Fastest-Growing Counties (2020–2025)
| Rank | County | State | Annual Growth | Primary Driver | | --- | --- | --- | --- | --- | | 1 | Kaufman County | TX | 8.9% | Dallas exurban spillover | | 2 | St. Johns County | FL | 7.2% | Jacksonville suburban expansion | | 3 | Comal County | TX | 6.8% | San Antonio metro spillover | | 4 | Hays County | TX | 6.5% | Austin remote-work inflow | | 5 | Pontotoc County | MS | 6.1% | Toyota manufacturing hub | | 6 | Lumpkin County | GA | 5.7% | Atlanta exurban migration | | 7 | Halifax County | NC | 5.4% | Retiree relocation | | 8 | Jasper County | SC | 5.3% | Hilton Head spillover | | 9 | Chambers County | AL | 5.1% | Auburn exurban growth | | 10 | San Miguel County | CO | 4.9% | Remote-work lifestyle migration |
(U.S. Census Bureau, Population Estimates Program, 2025)
Regional Shifts
Sun Belt
The Sun Belt — Texas, Florida, the Carolinas, Georgia, Arizona, and Tennessee — absorbed the largest share of net domestic migration. Texas and Florida alone added more than 1.5 million residents through net migration between 2020 and 2025 (U.S. Census Bureau, 2025).
Coastal Exodus
Coastal California and the New York metro area saw sustained net out-migration. Los Angeles County lost roughly 300,000 residents net over the period, and New York County (Manhattan) and Kings County (Brooklyn) each saw meaningful declines (U.S. Census Bureau, 2025).
Midwest
The Midwest saw a bifurcation: urban counties generally lost population while exurban counties within commuting distance of those cities grew. The pattern — "donut" growth around shrinking cores — repeated across Ohio, Michigan, and Illinois (Bureau of Labor Statistics, 2024).
Urban vs Suburban vs Exurban
| County type | 2020–2025 trend | Typical investor profile | | --- | --- | --- | | Urban core | Flat to declining | Income-producing rentals, long-term | | Inner suburban | Modest growth | Stable single-family, renter demand | | Exurban | Strongest growth | Appreciation plays, land banking |
Exurban counties — those 30–60 miles outside the urban core — grew at more than double the national average (U.S. Census Bureau, 2025).
Key Terms
- Natural Increase: Births minus deaths within a county. Counties with young populations can grow even with net out-migration; counties with aging populations need in-migration just to hold flat.
- Net Domestic Migration: U.S. residents moving in minus moving out. The leading indicator for housing demand.
- Net International Migration: Immigrants arriving minus emigrants leaving. Often stabilizes urban core populations.
- Exurban Counties: Counties 30–60 miles outside a metro core, typically rural or semi-rural, that receive spillover growth from the urban core.
- Population Estimate vs Census Count: The decennial census is a full count; annual estimates between censuses are model-based. Estimates for 2021–2024 are revised when the 2030 census lands.
What's Driving the Shifts
- Remote work: The share of U.S. workers working remotely at least part-time stabilized near 28% (Bureau of Labor Statistics, 2024), untethering households from job centers.
- Housing affordability: The median home in coastal California traded at more than 10x median household income; Sun Belt markets traded closer to 4–5x (National Association of Realtors, 2024).
- Climate migration: Counties with high climate risk saw net out-migration accelerate after 2021; lower-risk inland counties gained (First Street Foundation, 2024).
- Tax differences: State income tax gaps widened the migration pull — no-income-tax states Texas, Florida, and Tennessee ranked in the top net-migration recipients (Brookings Institution, 2024).
What This Means for Investors
Population growth is the single most reliable leading indicator for real estate demand. The counties in the top 10 above are the most likely to deliver above-trend appreciation over the next 5 years. But growth alone is not enough — pair it with income growth, job creation, and a reasonable price-to-income ratio. Use the county report to confirm the fundamentals before underwriting.
Sources
- U.S. Census Bureau, Population and Housing Unit Estimates, 2025.
- U.S. Bureau of Labor Statistics, Remote Work and Employment Statistics, 2024.
- National Association of Realtors (NAR), Affordability and Migration Index, 2024.
- First Street Foundation, Climate Migration Risk Report, 2024.
- Brookings Institution, Demographic Shifts and Domestic Migration, 2024.
- U.S. Census Bureau, Domestic Migration Flows, ACS, 2024.