United States Ski and Snowboard alpine ski racing program offers a network of competitive opportunities for ski racers of all ages from coast to coast. The country is split into three geographic racing regions including West, Rocky/Central, and Eastern. The USSA Central Division is part of the Rocky/Central Region. There are three local regions within the Central Division. These regions are defined geographically as:

CR 1:
Central The area of Minnesota, North Dakota, South Dakota, and Iowa west of Route 63
 

CR 2: 
The area of the Upper Peninsula of Michigan west of Route 77, Wisconsin , Iowa east of Route 63, Illinois and Missouri
 

CR 3:
The area of the Lower Peninsula of Michigan and the Upper Peninsula of Michigan east of Route 77, Ohio, Indiana and Kentucky 

More information can be found HERE