Homer,
Thanks for the information and excellent link. The explanation I have received and wanted to confirm was that when Illinois reached its enlistment quota men enlisted with neighboring states. It appears from the link you sent that a number of men were enlisted for the 11th MO in Richland and Lawrence Counties, Illinois, which are even farther away from Missouri than Clay County, where my Alexander Pryfogle enlisted.
Thanks again for the tip.
Kathy