Regions

E (East): CT, DC, DE, MA, MD, ME, NH, NJ, NY, PA, RI, VT

MW (Midwest): IA, IL, IN, KS, MI, MN, MO, ND, NE, OH, SD, WI

RM (Rocky Mountain): CO, MT, UT ,WY

S (South): AL, AR, FL, GA, KY, LA, MS, NC, SC, TN, VA, WV

SW (Southwest): NM, OK, TX

W (West): AK, AZ, CA, HI,  ID, NV, OR, WA