Shawn, according to Larry Manning of Community Planning & Development, Cripple Creek CO has adopted the 2003 versions of both the IRC and IBC. As far as I am aware, there is no building code restriction in the IRC regarding building height and stories. Since this is a single family home, the IRC would be the applicable building code. The zoning code would determine what height restrictions and setbacks are allowed by the Planning Department, and you should contact Larry at (719)689-3905 with specific requirements for permit.
Annette, I think California is unique in adopting the IBC and modifying it to include what would traditionally be viewed as an IRC building: single family home, duplex or townhouse.