The Boise City-Nampa Metropolitan Statistical Area (MSA), commonly known as The Treasure Valley, is an area consisting of five counties in southwestern Idaho. It is the state's largest MSA and includes four of Idaho's fastest growing cities – Boise, Nampa, Meridian, and Caldwell.

The Treasure Valley frequently receives national recognition for its quality of life and business climate. Some recent national rankings include:

• Best places for business and careers: # 3 (Forbes Magazine, 2007)
• Urban environment report card: # 6 (Earth Day Network, 2007)
• Boomtowns: Hottest cities for entrepreneurs (midsize cities): # 9 (Inc.com, 2007)
• Most secure places to live (500,000 or more residents): # 1 (Farmers Insurance 2006)