According to <HTTP: ballplayer.shtml players www.Baseball-almanac.com>, 16,219.
Quite an interesting site the above is. As of the start of the 2007 season, there have been 16,440 players in MLB. And for some useless trivia, there has never been an MLB player whose last name started with 'X'.
There is the NBA and there is a league with players not quite at the NBA level. The NBA is the major league with the professional basketball players. There are also college leagues, and elementary schools even have leagues.
Since 1915, only two "major" leagues have been in existence; and literally hundreds (if not thousands) of players have been on teams in both leagues. During the seasons of 1914 and 1915, the Federal League operated; and baseball history officially recognizes this as a "major" league. Scores of players -- including six future Hall of Famers -- played in this league as well as either the AL and the NL; so most likely dozens have played in three major leagues. Likewise, a few entire TEAMS jumped from the Player's Association (1890) to the American Association, and then to the National League. Thus, some players went through three leagues in just over three years! I doubt anyone has played in four leagues that are presently and unambiguously considered "major."
Yes, most major league players make their first great leap to the major leagues from Triple-A affiliates.
Well, in the Major Leagues in 1981 there were 26 teams, 12 in the National League and 14 in the American League. Each team had 25 players. So that means there were 650 players in the Major Leagues at any one time.
The size of the leagues, pay scales, players, and venues.
The major league players can still use spit tobacco while playing. It is against the rules in the minor leagues.
The percentage of little league players that make major league is about 5. 6 percent. That is less than 3 out of 50 people.
None of the players that played in the 1997 Major League Baseball World Series regardless of being from the American League Champion; Cleveland Indians or the National League Champion; Florida Marlins are currently playing in the Major Leagues as of 2014.