The Interior Plains of North America, also known as the Great Plains, don't have a single, fixed elevation. They are a vast region with gradual changes in elevation. Here's a breakdown:

* Average Elevation: The average elevation of the Interior Plains is around 2,000 feet (610 meters) above sea level.

* Range: The elevation varies significantly across the region, ranging from 1,000 feet (305 meters) in the east to over 5,000 feet (1,524 meters) in the west, where they meet the Rocky Mountains.

* Specific Areas:

* Eastern Plains: Lower elevation, with rolling hills and prairies.

* Central Plains: Higher elevation, characterized by vast grasslands and buttes.

* Western Plains: Highest elevation, marked by rugged canyons and mesas.

It's important to note that the elevation can change dramatically within a short distance, due to the presence of hills, valleys, and plateaus.