I grouped all 126 teams by regions:
North Group has 32 teams (Average OVR: 82.4)
South Group has 31 teams (Average OVR: 81.7)
Central Group has 31 teams (Average OVR: 83.6)
West Group has 32 teams (Average OVR: 82.1)
Then sorted within region by '13 Overall rating. I'll do this over when '14's Overalls are released.
Four groups with three conferences (except for the North, which only has two 16 team conferences)
Link to the Google Spreadsheet if you want to take my work and make some adjustments.
Here's a link the Google Map I made of all the teams, color coded by Group, further coded by conference and division.
If you find any mistakes (and I'm sure there are some), please let me know. It was a lot of info to sort through, so I'm sure I messed something up.