Melba is a village in Canyon County, Idaho. The population was 513 at the time of the 2010 census, up from 439 in 2000. It is part of the Boise …Melba is a village in Canyon County, Idaho. The population was 513 at the time of the 2010 census, up from 439 in 2000. It is part of the Boise metropolitan area. Melba was founded in 1912 by Clayton C. Todd, who named it after his daughter.