When I created my poll (
http://www.airforums.com/forum...oll-21413.html) of which region in the US to hold a regional forum rally, I did some research on what the region definitions were. There are a few different definitions out there so I had to decide which one to choose. The one I ended up choosing was the regional definition defined by the census bureau as that is also the regional definitions accepted by marketing firms etc. who base their mailings off of census bureau data:
Northeast -- New England (CT, ME, MA, NH, RI, VT)
Northeast -- Middle Atlantic (NJ, NY, PA)
South -- South Atlantic (DE, FL, GA, MD, NC, SC, VA, WV)
South -- East South Central (AL, KY, MS, TN)
South -- West South Central (AR, LA, OK, TX)
Midwest -- East North Central (IL, IN, MI, OH, WI)
Midwest -- West North Central (IA, KS, MN, MO, NE, ND, SD)
West -- Mountain (AZ, CO, ID, MT, NE, NM, UT, WY)
West -- Pacific (AK, CA, HI, OR, WA)
The bottom line, I think, it doesn't matter how you divide the country into regions, what matters is that you simply define how you are doing it so everyone is on the same page (whether or not they AGREE with your definition is a different story)!