Here's a list of the conferences and their stadium capacities:
Atlantic Coast Conference
Boston College - 44,500
Clemson - 81,500
Duke - 33,941
Florida State - 84,300
Georgia Tech - 55,000
Maryland - 54,000
Miami - 76,500
North Carolina - 60,000
North Carolina State - 57,583
Virginia - 61,500
Virginia Tech - 66,233
Wake Forest - 31,500
Big East
Cincinnati - 35,097
Connecticut - 40,000
Louisville - 42,000
Pittsburgh - 65,050
Rutgers - 52,454
USF - 65,000
Syracuse - 50,000
West Virginia - 60,000
Big Ten
Illinois - 70,000
Indiana - 52,692
Iowa - 70,585
Michigan - 110,001
Michigan State - 75,005
Minnesota - 50,805
Northwestern - 49,256
Ohio State - 102,329
Penn State - 107,282
Purdue - 62,500
Wisconsin - 80,321
Big Twelve
Colorado - 53,750
Iowa State - 55,000
Kansas - 50,071
Kansas State - 52,200
Missouri - 71,004
Nebraska - 81,067
Baylor - 50,000
Oklahoma - 82,112
Oklahoma State - 60,218
Texas - 100,119
Texas A&M - 83,002
Texas Tech - 61,000
Conference USA
Houston - 32,000
Rice - 47,000
SMU - 32,000
UTEP - 51,500
Tulane - 69,703
Tulsa - 30,000
UAB - 71,594
UCF - 45,301
East Carolina - 53,000
Marshall - 38,019
Memphis - 62,380
Southern Miss - 36,000
Mid-America
Akron - 30,000
Ball State - 25,400
Bowling Green - 23,724
Buffalo - 31,000
Central Michigan - 30,199
Eastern Michigan - 30,200
Kent State - 25,000
Miami - 24,286
Northern Illinois - 31,000
Ohio - 24,000
Temple - 68,532
Toledo - 26,248
Western Michigan - 30,200
Mountain West
Air Force - 52,480
BYU - 64,045
Colorado State - 34,000
New Mexico - 40,094
San Diego State - 71,400
TCU - 44,358
UNLV - 36,800
Utah - 45,017
Wyoming - 30,514
Pac-10
Arizona - 57,803
Arizona State - 71,706
California - 71,799
Oregon - 54,000
Oregon State - 45,674
Stanford - 50,000
UCLA - 91,936
USC - 93,607
Washington - 72,500
Washington State - 40,000
SEC
Florida - 88,548
Georgia - 92,746
Kentucky - 67,530
South Carolina - 80,250
Tennessee - 100,011
Vanderbilt - 39,790
Alabama - 92,138
Arkansas - 76,000
Auburn - 87,451
LSU - 92,400
Ole Miss - 60,850
Mississippi State - 55,082
Sun Belt
Arkansas State - 33,410
Florida Atlantic - 20,450
Florida International - 20,000
Louisiana-Lafayette - 31,000
ULM - 30,427
Middle Tennessee State - 31,000
North Texas - 30,500
South Alabama - 40,646
Troy - 30,000
Western Kentucky - 22,000
Western Athletic
Boise State - 33,500
Fresno State - 41,031
Hawaii - 50,000
Idaho - 16,000
Louisiana Tech - 30,600
Nevada - 29,993
New Mexico State - 30,343
San José State - 30,578
Utah State - 25,500
Independents
Army - 40,000
Navy - 34,000
Notre Dame - 80,975