Payette County is a county located in Idaho in the United States of America. As of the 2020 census, the population was 25,386. The county seat and largest city is Payette.

Canyon County is located in the U.S. state of Idaho. As of the 2020 Census, the population was 231,105, which by 2022 was estimated to have risen to 251,065. making it the second-most populous county in Idaho. The county seat is Caldwell, and its largest city is Nampa. Canyon County is part of the Boise metropolitan area.