Growth Is Not Uniform — It Clusters in Specific ZIP Codes
National population growth in the US averaged roughly 0.4–0.6% annually in 2023–2025. But that average conceals enormous variation: some ZIP codes are growing 5–10% per year while others lose population at similar rates. The fastest-growing ZIP codes are magnets for jobs, migration, and investment — and understanding what drives them provides valuable signal for housing decisions and economic forecasting.
Data sources for this analysis include USPS active address counts, USPS change-of-address filings, Census Bureau building permit data, and Zillow transaction and listing volumes. You can look up any ZIP code to see its current demographic profile.
Top Fastest-Growing ZIP Codes — 2025–2026
Sun Belt Suburbia: The Dominant Pattern
The overwhelming majority of the fastest-growing ZIP codes in 2025–2026 are Sun Belt suburbs — outer-ring and exurban communities in Texas, Florida, Arizona, Tennessee, Georgia, and the Carolinas. The pattern reflects continued domestic migration from high-cost coastal metros, remote work flexibility, and aggressive housing construction in these markets.
| ZIP | Community | State | Est. Annual Growth Rate | Primary Driver |
|---|---|---|---|---|
| 78660 | Pflugerville | TX | 6.8% | Austin tech spillover, affordability |
| 85396 | Buckeye (NW) | AZ | 6.5% | Phoenix exurb expansion, master-planned communities |
| 34110 | North Naples | FL | 5.9% | Retirement migration, luxury development |
| 37067 | Franklin | TN | 5.7% | Nashville overflow, tech/healthcare jobs |
| 29732 | Rock Hill | SC | 5.5% | Charlotte exurb, manufacturing investment |
| 30680 | Winder | GA | 5.4% | Atlanta exurb, industrial/logistics growth |
| 89166 | Las Vegas NW | NV | 5.2% | California migration, new master-planned communities |
| 77354 | Magnolia | TX | 5.0% | Houston exurb, acreage properties, remote work |
Mountain West: Slower Growth but Rising Rapidly
| ZIP | Community | State | Est. Annual Growth Rate | Primary Driver |
|---|---|---|---|---|
| 84003 | American Fork | UT | 4.8% | Silicon Slopes tech corridor, family demographics |
| 83616 | Eagle | ID | 4.6% | Boise metro expansion, California migration |
| 80516 | Erie | CO | 4.3% | Denver/Boulder affordability overflow |
What Drives Rapid ZIP Code Growth
Several factors reliably produce fast-growing ZIP codes:
New Housing Construction
Population can only grow where housing units are being built. Greenfield suburban development — new master-planned communities with thousands of homes on former agricultural land — produces the fastest population growth. The fastest-growing ZIPs in America almost always have extremely high building permit issuance rates.
Job Proximity
Growth follows jobs. The Austin-Round Rock corridor (Samsung, Tesla gigafactory, Apple campus), the Phoenix West Valley (semiconductor fabs including TSMC), and Nashville's healthcare corridor are driving surrounding ZIP code growth by creating employment that attracts workers who need housing.
Affordability Relative to Origin Markets
Domestic migration is heavily driven by relative affordability. A Bay Area tech worker who can work remotely and move to Pflugerville, TX gets a $1 million house for $450,000 — a powerful incentive. The fastest-growing ZIP codes are typically affordable relative to where migrants are coming from, not necessarily cheap in absolute terms.
Retirement Migration
Florida, Arizona, and parts of the Carolinas continue to attract baby boomers entering retirement. Sun Belt retirement communities and age-55+ planned developments drive population growth in specific ZIP codes without corresponding school enrollment growth.
Risks in Fast-Growing ZIP Codes
Rapid growth creates real challenges for residents and investors:
- Infrastructure lag: Roads, schools, water, and sewer capacity often can't keep pace with population growth. Fast-growing Texas and Arizona suburbs frequently face 30–40 minute commutes within the suburb itself as traffic volume exceeds road capacity.
- Property tax increases: New residents need services; municipalities often raise property tax rates or assessments to fund schools, fire, and public works.
- New supply suppresses appreciation: In fast-building markets, the abundance of new construction can limit price appreciation for existing homes. Appreciation in Buckeye, AZ has been volatile and sometimes negative during periods of heavy new construction.
- Builder risk: If job growth slows or migration reverses, rapidly built markets can have significant price corrections — the Inland Empire California in 2007–2009 is the canonical example.
Fastest-Declining ZIP Codes: The Other Side
For every fast-growing ZIP, others are losing population rapidly:
- Rural Appalachian ZIP codes in eastern Kentucky, West Virginia, and western Pennsylvania continue multi-decade population decline
- Rural Great Plains ZIP codes lose young residents to urban areas each year
- Certain inner-ring industrial suburbs in Rust Belt cities continue steady population loss
- Some California coastal ZIP codes saw population declines 2020–2023 as outmigration exceeded in-migration for the first time in decades
Use our ZIP comparison tool to see population trends alongside income and housing data for any ZIP code you're researching.