7530 - Northeastern West Virginia      7680 - West-Central North Carolina
7550 - Southern West Virginia          7690 - Piedmont North Carolina
7570 - Western Virginia                7710 - Raleigh Area North Carolina
7600 - Southeastern Virginia           7720 - Northeastern North Carolina
7610 - Eastern Virginia                7730 - Southeastern North Carolina
7620 - Central Maryland and Wash. DC   7750 - Western South Carolina
7630 - Eastern Maryland and Delaware   7770 - Eastern South Carolina
7670 - Western North Carolina