From a different thread I posted in last year ( Slight changes obviously since then) but shows USC Penn St and Texas as the powerhouses of the game.
Put together list of the 7 Worlds I had access to (Sorry Yost, Warner, Leahy) and here are the results -
University of Southern California 147
Pennsylvania State University 132
University of Texas at Austin 125
Louisiana State University 94
University of Oklahoma 91
Ohio State University 86
University of Alabama, Tuscaloosa 80
University of Miami (Florida) 79
University of Notre Dame 79
University of Tennessee, Knoxville 55
Boston College 49
Rutgers, State University of New Jersey, New Brunswick 35
University of Florida 33
University of Michigan 31
Florida State University 28
University of Connecticut 27
University of Nebraska, Lincoln 24
University of Georgia 18
University of Arizona 17
University of California, Berkeley 17
Syracuse University 15
University of California, Los Angeles 14
Temple University 11
University of Virginia 10
University of Washington 10
Texas A&M University, College Station 9
West Virginia University 9
University of North Carolina, Chapel Hill 7
University of Central Florida 6
University of Minnesota, Twin Cities 6
University of South Florida 5
University of Cincinnati 4
University of Louisville 4
University of Maryland, College Park 4
University of Missouri, Columbia 4
University of Wisconsin, Madison 4
Arizona State University 3
Bowling Green State University 3
Clemson University 3
Duke University 3
Marquette University 3
Stanford University 3
Virginia Polytechnic Institute and State University 3
Western Michigan University 3
Colorado State University 2
Southern Methodist University 2
University of Arkansas, Fayetteville 2
University of Iowa 2
University of Memphis 2
University of Mississippi 2
University of Pittsburgh 2
University of South Carolina, Columbia 2
Vanderbilt University 2
Washington State University 2
Baylor University 1
Brigham Young University 1
Central Michigan University 1
East Carolina University 1
Kansas State University 1
Michigan State University 1
Middle Tennessee State University 1
Northern Illinois University 1
Northwestern University 1
Oregon State University 1
Purdue University 1
Texas Christian University 1
University at Buffalo 1
University of Colorado, Boulder 1
University of Houston 1
University of Illinois, Champaign 1
University of Kansas 1
University of Louisiana at Monroe 1
University of North Texas 1
University of Texas at El Paso 1
University of Tulsa 1
US Military Academy 1
US Naval Academy 1
Wake Forest University 1