It depends on the level of the game.
Youth games have 2 to 4 officials working those games. They try to schedule 3 or 4.
Freshamn have 3 officials working those game. (Referee, Umpire and Head Linesman)
J.V. has 4 officials working those games. (Referee, Umpire, Line judge and Head Linesman)
Varsity has 5 officials working those games. (Referee, Umpire, Line Judge, Head Linesman and Back Judge)
College and NFL games have 7 officials working those games (same as High school varsity, but also with Field Judge and Side Judge)
Three, a center and two assistants. Possibly four if there is a fourth official on the sideline.
Four. One in the center, two assistant referees, and one fourth official.
players, match officials, Referees, assistant referees, stewards
3 referees are in soccer and football
It is either the F.A, The U.E.F.A or F.I.F.A.
British American Football Referees' Association was created in 1984.
two referees, and the coaches of course
Yes the referees can interfere in a match
Referees are needed to see if the match is fairly played and to help if someone is injured.
No, just referees.
Referees do not wear any numbered jerseys.