For the start of the 2009 NFL regular season LSU & Miami are tied for the most players on NFL rosters with 41 players.
current list is at http://espn.go.com/nfl/college
2011 - Texas has 46
There are actually 5 high schools that share lead for most National Football League's players;
Check out the link attched
Woodland Hills high school
The school with the most players in the NFL is the Miami Hurricanes also nicknamed "The Factory" because it is like a factory on how many NFL players it produces.
The University of Texas
U of Miami....
The Denver Brocos with 32 players from Texas on its 2013 roster
Woodland Hills High School.