Nampa ( (listen)) is the largest city of Canyon County, Idaho. The population of Nampa was 81,557 at the 2010 census and, as of 2018, is the third-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. Nampa is the second principal city of the Boise-Nampa metropolitan area. The name "Nampa" may have come from a Shoshoni word meaning either moccasin or footprint or, as a local historian Joe Bell theorizes, the name is an acronym for North American Meat Packers Association.