Idaho Falls & Ammon

The urban heart of the metro, where Idaho Falls (pop. ~67,000) and Ammon (pop. ~19,000) form a contiguous developed area along the Snake River. Idaho Falls is the commercial and cultural hub of eastern Idaho, while Ammon — directly east — is one of the fastest-growing cities in the state, known for its family-friendly subdivisions, community fiber-optic network, and excellent schools. Together they account for over half the metro's population.