What are the fastest-growing counties in Utah?
Tooele County is the fastest-growing county in Utah: its population grew 3.58% a year from 2020 to 2025, to 87,461 residents (Census PEP Vintage 2025). Washington County (3.26%) and Iron County (3.08%) follow. Utah as a whole grew 1.51% a year to 3,538,904 residents.
Data as of 2026-09-23. Population, growth and migration: PEP Vintage 2025 · 2020–2025. Income migration: IRS SOI 2022–2023 (2-yr lag).
Top 10 counties in Utah by population growth, 2020 to 2025
| Rank | County | Population | Growth (% per year) | Net domestic migration | Net international migration | IRS net AGI migration |
|---|---|---|---|---|---|---|
| 1 | Tooele County | 87,461 | 3.58% | +10,387 | +730 | +$46.2M |
| 2 | Washington County | 213,670 | 3.26% | +27,818 | +1,678 | +$189.0M |
| 3 | Iron County | 67,141 | 3.08% | +6,796 | +753 | +$29.7M |
| 4 | Juab County | 13,567 | 2.79% | +1,103 | +43 | +$6.5M |
| 5 | Utah County | 759,859 | 2.75% | +33,354 | +18,542 | +$181.0M |
| 6 | Box Elder County | 65,320 | 2.43% | +5,184 | +469 | +$29.3M |
| 7 | Sanpete County | 31,453 | 1.97% | +1,618 | +630 | +$8.6M |
| 8 | Wasatch County | 38,514 | 1.90% | +1,837 | +755 | +$123.3M |
| 9 | Cache County | 145,000 | 1.65% | +2,760 | +1,988 | -$27.6M |
| 10 | Morgan County | 13,383 | 1.56% | +645 | +9 | +$14.7M |
Where are people moving in Utah?
Utah County gained the most people from elsewhere in the United States: net domestic migration of +33,354 from 2020 to 2025 (Census PEP Vintage 2025). The table ranks every Utah place with 10,000 or more residents by that figure; the IRS column shows net adjusted gross income migration for 2022 to 2023.
| Rank | County | Population | Growth (% per year) | Net domestic migration | Net international migration | IRS net AGI migration |
|---|---|---|---|---|---|---|
| 1 | Utah County | 759,859 | 2.75% | +33,354 | +18,542 | +$181.0M |
| 2 | Washington County | 213,670 | 3.26% | +27,818 | +1,678 | +$189.0M |
| 3 | Tooele County | 87,461 | 3.58% | +10,387 | +730 | +$46.2M |
| 4 | Iron County | 67,141 | 3.08% | +6,796 | +753 | +$29.7M |
| 5 | Weber County | 278,174 | 1.13% | +5,472 | +2,582 | +$89.7M |
| 6 | Box Elder County | 65,320 | 2.43% | +5,184 | +469 | +$29.3M |
| 7 | Cache County | 145,000 | 1.65% | +2,760 | +1,988 | -$27.6M |
| 8 | Wasatch County | 38,514 | 1.90% | +1,837 | +755 | +$123.3M |
| 9 | Sanpete County | 31,453 | 1.97% | +1,618 | +630 | +$8.6M |
| 10 | Uintah County | 38,278 | 1.42% | +1,304 | +378 | +$3.3M |
Go past the headline numbers
The interactive Demographics map layer and the full report for a single place are part of paid plans.
Get the Demographics Report for Tooele CountyFrequently asked questions
- What are the fastest-growing counties in Utah?
- By population growth from 2020 to 2025, the fastest are Tooele County (3.58% a year), Washington County (3.26% a year), Iron County (3.08% a year), Juab County (2.79% a year) and Utah County (2.75% a year) (Census PEP Vintage 2025). Only places with 10,000 or more residents are ranked.
- Where are people moving in Utah?
- By net domestic migration from 2020 to 2025, the largest gains are Utah County (+33,354), Washington County (+27,818) and Tooele County (+10,387) (Census PEP Vintage 2025).
- How fast is Utah growing overall?
- Utah grew 1.51% a year from 2020 to 2025, to 3,538,904 residents, with net migration of +135,259 people (Census PEP Vintage 2025).
- Where does this Utah data come from, and how current is it?
- Population, growth and migration come from the U.S. Census Bureau Population Estimates Program (PEP Vintage 2025 · 2020–2025). Income migration comes from IRS Statistics of Income (IRS SOI 2022–2023 (2-yr lag)). Counties with fewer than 10,000 residents are not ranked (8 of 29 in Utah). Data last loaded 2026-09-23.
Data as of 2026-09-23: sources and periods
- Population, growth and migration
- U.S. Census Bureau, Population Estimates Program: PEP Vintage 2025 · 2020–2025. census.gov/programs-surveys/popest
- Income migration (net AGI)
- Internal Revenue Service, Statistics of Income migration data: IRS SOI 2022–2023 (2-yr lag). irs.gov/statistics/soi-tax-stats-migration-data
How to read the table
- Population is the Census July 1 estimate of the latest vintage.
- Growth is the compound annual rate over 2020 to 2025.
- Net domestic and international migration are cumulative people over 2020 to 2025.
- IRS net AGI migration is adjusted gross income that moved in, less what moved out, for 2022 to 2023. A plus sign means a net inflow.
- Places with fewer than 10,000 residents are left out of the rankings.