Boise Metro Area Counties
5 counties · 864,243 people (2025) · 11,767 sq mi
The Boise metro area (officially the Boise City, ID Metropolitan Statistical Area) has 5 counties in Idaho, with 864,243 people in 2025. Ada County is the most populous.
The 5 counties of the Boise metro area
Sorted by population. 1 is a central county (the urban core); the others are outlying counties tied to it by commuting.
| County | County seat | Population 2025 | Change since 2020 | Land area (sq mi) | Type |
|---|---|---|---|---|---|
| Ada County | Boise | 546,141 | +10.3% | 1,052 | Central |
| Canyon County | Caldwell | 275,123 | +19.1% | 587 | Outlying |
| Gem County | Emmett | 21,773 | +13.8% | 560 | Outlying |
| Owyhee County | Murphy | 12,661 | +6.3% | 7,668 | Outlying |
| Boise County | Idaho City | 8,545 | +12.3% | 1,899 | Outlying |
The metro area is part of the larger Boise City-Mountain Home-Ontario, ID-OR Combined Statistical Area.
Printable map
The PDF is a vector file for Letter paper; the PNG is 2400 pixels wide. Both are free to use with a credit to WhichCounty.
County maps of Idaho
Other metro areas
- New York City Metro Area Counties 22 counties
- Los Angeles Metro Area Counties 2 counties
- Chicago Metro Area Counties 13 counties
- Dallas–Fort Worth Metro Area Counties 11 counties
- Houston Metro Area Counties 10 counties
- Atlanta Metro Area Counties 29 counties
- Washington, D.C. Metro Area Counties 23 counties
- Miami Metro Area Counties 3 counties
- Philadelphia Metro Area Counties 11 counties
- Phoenix Metro Area Counties 2 counties
- Boston Metro Area Counties 7 counties
- Inland Empire Metro Area Counties 2 counties
- San Francisco–Oakland Metro Area Counties 5 counties
- Detroit Metro Area Counties 6 counties
- Seattle Metro Area Counties 3 counties
- Minneapolis–St. Paul Metro Area Counties 15 counties
- Tampa Bay Metro Area Counties 4 counties
- Denver Metro Area Counties 10 counties
- Orlando Metro Area Counties 4 counties
- Charlotte Metro Area Counties 11 counties
- Baltimore Metro Area Counties 7 counties
- St. Louis Metro Area Counties 15 counties
- San Antonio Metro Area Counties 8 counties
- Austin Metro Area Counties 5 counties
Sources
- Metro area definition: U.S. Office of Management and Budget, Core Based Statistical Areas, July 2023 delineation (published by the Census Bureau).
- Boundaries: U.S. Census Bureau 2025 cartographic boundary files. Population: Census Bureau estimates, Vintage 2025.