what county is nampa idaho in
Nampa, Idaho. Nampa (/ËnÃ¦mpÉ/) is the largest city of Canyon County, Idaho, USA. The population of Nampa was 81,557 at the 2010 census making it the second-most populous city in Idaho. Nampa is located about 20 miles (32 km) west of Boise along Interstate 84, and six miles (10 km) west of Meridian.