There are seven on field officials in an American football game: referee, umpire, head linesman, line judge, side judge, field judge, back judge.
Click on the 'NFL Officials' link on this page to read about the duties that each official has during a game.
There are 7 referees in a game.
they get about £2000 a game depending on what game
In American football referees use flags to indicate various penalties.
There are four referees in a baseball game.
3 referees are in soccer and football