Idaho local data guide

Boise, Idaho Population Data

As of 2026, Boise remains the most populous city in Idaho, serving as the cultural and economic anchor of the Treasure Valley. While the city proper continues to see steady, modest growth, the broader metropolitan area is experiencing more rapid expansion, driven largely by development in surrounding suburban communities.

Updated with grounded research as of 2026-07-20.

The short answer

Boise City has an estimated 2026 population of 238,853. The broader Boise Metropolitan Statistical Area, which encompasses Ada, Boise, Canyon, Gem, and Owyhee counties, continues to grow, with estimates indicating the region has surpassed 876,000 residents.

Key facts

Boise City Population (2026 Estimate): 238,853
Boise Metropolitan Area Population (2026 Estimate): Over 876,000
2020 Census Population (Boise City): 235,685

City vs. Metropolitan Growth

While Boise City remains the state's largest municipality, recent growth patterns show significant shifts toward the surrounding Treasure Valley. Smaller cities such as Star and Kuna have recorded double-digit percentage growth rates, significantly outpacing the growth within Boise city limits.

Defining the Boise Metropolitan Area

The Boise Metropolitan Statistical Area (MSA) is a vital regional economic hub. It is formally defined to include five counties: Ada, Boise, Canyon, Gem, and Owyhee. This region accounts for a substantial portion of Idaho's total population and remains one of the fastest-growing areas in the Western United States.

Demographic Context

Boise maintains a median age of approximately 38.6 years. The region's expansion is fueled by a mix of steady in-migration and retention, with new residents often seeking a balance of urban amenities and the affordability provided by the surrounding suburbs.

Common questions

Is Boise still the fastest-growing city in Idaho?

While Boise is the most populous city, recent data from the Community Planning Association of Southwest Idaho (COMPASS) indicates that smaller municipalities like Star and Kuna are experiencing higher percentage-based growth rates.

What counties are included in the Boise Metropolitan Area?

The Boise MSA consists of Ada, Boise, Canyon, Gem, and Owyhee counties.