The answer depends on many factors. While there generally is no set number (NBA teams are always signing/waiving players throughout the year), "professional" can refer to more than just the NBA.
A list of some leagues that are considered professional:
Whether we are counting all United States born basketball players or just those currently in the United States, as well as those who were born outside of the United States that are playing in the United States can bring about a wide variety of answers.
If you are referring to NBA players only, the best guess would be about 420 NBA players (30 teams with a maximum of 15 players, and one roster spot is usually left open).
There are over 100 countries that have professional basketball leagues around the world, with varying levels of competition and popularity. The NBA in the United States is considered the most prominent and widely followed basketball league globally.
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There are too many to count. There are dozens and dozens of basketball leagues, a few American football leagues, soccer leagues, many baseball leagues, and so on. There is no kept count of professional athletes.
95% Blacks to 5% whites play professional basketball. There should be two separate leagues for blacks and whites to play.
i would say 99% of countries have a basketball league, and probably 60 % of those are pro.
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There are many professional basketball leagues for men over 35 years old . Most notably the NBA has many excellent players over the age of 35.
Many many countries around the world have professional leagues. The biggest ones are in England, Spain and Italy these are regarded as the greatest leagues in the world. It is very popular in many other countries like in Mexico, USA and South America.
The Negro leagues were US professional baseball leagues. The term is usually used to include 7 leagues, also called "Negro Major Leagues" which began in 1920.
5, in most leagues
Its more of a gym sport etc. Not many places in the world play it and im pretty sure there arent any professional leagues.
There is no specific number, as the number is always growing and or shrinking. However, if you take the NBA (30 teams, 15 player= 450), and know that there are two main other leagues (European and Spanish), then you get around 1,000 players. However, including the D-League and all other leagues, the number of people that play professional basketball worldwide would be around 10,000 people.