Region VI

Missouri Valley Branch 

This territory includes all zip codes in the states of Kansas, Nebraska, and Oklahoma.

Rio Grande Branch 

This territory includes zip codes in the state of New Mexico and Texas zip code areas 79800-79999, 88500-88599.

Rocky Mountain Branch 

This territory includes all zip codes in the states of Colorado and Wyoming

Texas Branch

This territory includes zip codes in the state of Texas excluding 79800-79999, 88500-88599.