There are 4 umpires in a regulation game. The umpire-in-chief stands behind home plate. The other 3 umpires stand somewhere behind each base. These umpires must stand at a position which will allow them to see a play clearly, so there's really no set position they must stand while a game is in session.
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He or She stands behind the catcher and sometimes there might be another one in the infield like around 2nd base. :)