Final answer:
The cities Nampa, Meridian, Idaho Falls, Pocatello, and Coeur d'Alene are all in the state of Idaho, which is part of the Mountain West region of the United States.
Step-by-step explanation:
The cities Nampa, Meridian, Idaho Falls, Pocatello, and Coeur d'Alene are all located in the state of Idaho. This state is part of a region known as the Mountain West, which is characterized by its significant mountain ranges such as the Rocky Mountains, the Sierra Nevada, and other geographical features like the Cascades and Intermontane Basins and Plateaus.
Idaho is included in this region alongside other states, but it is the specific state where the mentioned cities are found.