The NCAA defines a game ball as a "prolate spheroid" which measures 10 7/8" to 11 7/16" long, 20 3/4" to 21 1/4" around middle and 27 3/4" to 28 1/2" around the long circumference. Wilson is licensed by the NCAA as having the official game ball. Wilson's website indicates the Wilson 1001 and 1005 are used by 24 D-I programs, and their footballs are stamped with the NCAA logo. Nike produces the Nike 3005, which is used by over 70 D-I programs. Spalding also produces the Spalding J5V Advance, which is used by Auburn. While Nike may provide footballs for more D-I programs, you would also have to account for all the D-IA, D-II, and D-III programs, where Wilson is likely used by a majority of the schools.
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It is 30 inches in circumference, I play high school Basketball and we use the same size. Kids in 5th or 6th grade use a 28.5 size ball. Once you get to 7th grade you use an official 30 inch ball. Wilson and Spalding are by far the best basketballs if you are looking to buy one.
The NCAA prefers the hand-crafted Wilson brand footballs made in Ada, Ohio these run around 60$ new and are only made in this one factory, however you can get "official" College Football size footballs with ease at a local sporting goods store. That is, if you don't really want a high-end leather football with a good brand name. It's a matter of personal preference.