What States Make up the Great Plains?
In the U.S., all or part of the states of Colorado, Kansas, Montana, Nebraska, New Mexico, North Dakota, Oklahoma, South Dakota, Texas and Wyoming make up the area known collectively as the Great Plains. In addition to the 10 U.S. states that make up the Great Plains, three Canadian provinces — Alberta, Manitoba and Saskatchewan — are also part of the region.
Generally, the Great Plains are located west of the Mississippi River and east of the Rocky Mountains, extending through the United States and Canada. The area is so named because of the wide expanse of flat land, with the majority covered in grasslands and prairies.