It travels along the north side of Lake Pend Oreille and the Clark Fork River between the Sandpoint area and the Montana border, where it continues as Montana Highway 200.

Idaho SH-200 starts at a junction with U.S. Highway 95 in Ponderay, a small community north of Sandpoint.

The highway heads eastward along the north shores of lake Pend Oreille at the very feet of the Cabinet Mountains with several turnouts and scenic overlooks.

ID-200 is the westernmost portion of a chain of Highway 200s which extends east through Montana, North Dakota, and Minnesota.

There is another highway called SR 20 in Washington that would complete the chain of Hwy 200s, but ID-200 is no longer directly connected to WA-20.