This is data (five-year average home attendance) from College Football News (linked):

1 Michigan 109,574
2 Ohio State 106,048
3 Penn State 102,774
4 Texas A&M 101,861
5 Alabama 101,550
6 LSU 100,856
7 Tennessee 98,013
8 Texas 94,754
9 Georgia 92,746
10 Nebraska 90,055
11 Florida 86,557
12 Auburn 86,549
13 Oklahoma 86,126
14 Clemson 81,586
15 Notre Dame 79,525
16 Wisconsin 78,573
17 South Carolina 77,867
18 Florida State 74,292
19 Michigan State 73,815
20 USC 69,044
21 Iowa 66,938
22 Washington 65,781
23 Arkansas 65,588
24 UCLA 63,635
25 Virginia Tech 61,562
26 Ole Miss 60,250
27 Mississippi State 59,477
28 Missouri 57,211
29 Texas Tech 56,924
30 Kentucky 56,819
31 West Virginia 56,639
32 BYU 56,597
33 NC State 56,517
34 Oregon 56,275
35 Miami 55,760
36 Oklahoma State 55,240
37 Iowa State 55,042
38 Kansas State 51,827
39 Arizona State 51,504
40 Louisville 50,503