Regions, Conferences, Teams,..... A little more information

The NCAA (National Collegiate Athletic Association) is the governing body over most intercollegiate athletics. (The NAIA, National Association of Intercollegiate Athletics) is another governing body on a far smaller scale.

The NCAA divides Football up into three classifications.
Division I
Division II and
Division III

Division I

DI is further divided into the FBS, and the FCS (Football Bowl Subdivision, and the Football Championship Subdivision) The main distinction between these two areas of DI are the available scholarships, and their championship format. The FBS uses the Bowl system to determine a champion, and the FCS utilizes a playoff format.
There are a total of 325 DI institutions in the country, and of these 238 have football programs. 97 do not sponsor football as a sport.

66% of DI institutions are public, and 34% are private

Division II

There are 288 DII institutions, and 152 that offer football as a sport. These schools have fewer scholarships that a DI school, but do utilize a playoff format to determine their champion.
Of these institutions, 53% are public, and 47% are private.

Division III

There are 447 member institutions. Of these, 238 offer football as a sport. Division III does not offer scholarships of any kind. This division is truly made up of players that play for the love of the game. While it does occasionally happen, it is rare that a D3 player will make it to the professional ranks in football.
Of the 447 institutions, 20% are public, and 80% are private.

D3 Regions

Division III football is primarily concentrated in the Midwest, South and East, but there are teams located as far as California. The D3 football landscape is divided into four regions. North, South, East and West. These regions are each made up of conferences that fall within a specific region. These conferences are made up of member institutions that are relatively close geographically.

Link to a map of D3 schools.
http://upload.wikimedia.org/wikipedia/commons/0/01/NCAA_Division_3_football_map.gif