Growth brief
Treasure Valley population growth in 2026: where 28,920 additional residents were counted
A city-by-city and county-level analysis of the 2026 COMPASS population estimates for Ada and Canyon counties.
Read researchMarket reports
Population & growth
City population estimates and annual growth across the Treasure Valley.
Published resources
Growth brief
Treasure Valley growth in 2025: accounting for a 24,950-person estimated increase
A source-linked review of 2025 population change across Ada and Canyon counties, including all nine Renew Atlas cities.
Read researchCity baselines
COMPASS city-limit estimates, 2025–2026. The regional archive includes Nampa, Caldwell, and Middleton alongside the six Atlas markets.
Ada County
Boise
- 2025 population
- 253,550
- 2026 population
- 256,450
- Annual change
- 2,900 (1.1%)
Ada County
Meridian
- 2025 population
- 147,340
- 2026 population
- 152,070
- Annual change
- 4,730 (3.2%)
Canyon County
Nampa
- 2025 population
- 123,220
- 2026 population
- 126,810
- Annual change
- 3,590 (2.9%)
Canyon County
Caldwell
- 2025 population
- 77,610
- 2026 population
- 82,770
- Annual change
- 5,160 (6.6%)
Ada & Boise counties
Eagle
- 2025 population
- 38,920
- 2026 population
- 40,450
- Annual change
- 1,530 (3.9%)
City total combines the Ada County and Boise County portions published by COMPASS.
View Community Planning Association of Southwest Idaho (COMPASS) sourceAda County
Kuna
- 2025 population
- 33,750
- 2026 population
- 38,560
- Annual change
- 4,810 (14.3%)
Ada & Canyon counties
Star
- 2025 population
- 22,370
- 2026 population
- 25,660
- Annual change
- 3,290 (14.7%)
City total combines the Ada County and Canyon County portions published by COMPASS.
View Community Planning Association of Southwest Idaho (COMPASS) sourceAda County
Garden City
- 2025 population
- 13,730
- 2026 population
- 14,010
- Annual change
- 280 (2%)
Canyon County
Middleton
- 2025 population
- 13,970
- 2026 population
- 15,110
- Annual change
- 1,140 (8.2%)