The Boise–Nampa, Idaho Metropolitan Statistical Area (MSA) (commonly known as the Boise Metropolitan Area or the Treasure Valley) is an area that encompasses Ada, Boise, Canyon, Gem, and Owyhee counties in southwestern Idaho, anchored by the cities of Boise and Nampa.^[2] It is the main component of the wider Boise–Mountain Home–Ontario, ID–OR Combined Statistical Area, which adds Elmore and Payette counties in Idaho and Malheur County, Oregon. It is the state's largest officially designated metropolitan area and includes Idaho's three largest cities: Boise, Nampa, and Meridian. Nearly 40 percent of Idaho's total population lives in the area.

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Boise metropolitan area
Metropolitan statistical area
Boise–Nampa, Idaho Metropolitan Statistical Area
Coordinates: 43°30′N 116°30′W
Country	United States
State(s)	Idaho and Oregon
Largest city	Boise
Other cities	– Nampa – Meridian – Caldwell
Area
• Total	11,833.06 sq mi (30,647.5 km2)
Highest elevation	10,751 ft (3,277 m)
Lowest elevation	2,000 ft (610 m)
Population  (2020)
• Total	764,718
• Rank	75th in the U.S.
• Density	52.1/sq mi (20.118/km2)

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As of the 2021 estimate, the Boise–Nampa, Idaho Metropolitan Statistical Area (MSA) had a population of 795,268,^[3] while the larger Boise City–Mountain Home–Ontario, ID–OR Combined Statistical Area (CSA) had a population of 850,341.^[4] The metro area is currently the third largest in the U.S. section of the Pacific Northwest after Seattle and Portland, and is the 75th-largest metropolitan area in the United States.

As of the 2010 census, there were 616,561 people, 170,291 households, and 120,118 families residing within the MSA. The racial makeup of the MSA was 89.80% White, 0.52% African American, 0.80% Native American, 1.38% Asian, 0.14% Pacific Islander, 5.02% from other races, and 2.35% from two or more races. Hispanic or Latino of any race were 8.96% of the population.

The median income for a household in the MSA was $36,695, and the median income for a family was $42,196. Males had a median income of $31,854 versus $23,244 for females. The per capita income for the MSA was $17,041.

^[5]

• Micron Technology^[7] Boise, Nampa
• Saint Luke's Medical Centers^[8] Boise, Meridian, Eagle, Nampa
• Saint Alphonsus Regional Medical Centers^[9] Boise, Nampa, Caldwell, Ontario
• Simplot^[10] Boise, Caldwell
• Hewlett-Packard^[11] Garden City / Boise
• Blue Cross Blue Shield Association^[12] Meridian
• Union Pacific Railroad^[13] Nampa
• T-Mobile US^[14] Meridian
• DirecTV^[15] Boise
• Teleperformance^[16] Boise

• Idaho census statistical areas