cincinnati reds won their 10000 on 4/20/12
They have a playoff
30 in MLB.
There are only 30 MLB teams in the MLB, but there are many places with a minor league park, but there are a few cities like Chicago and Los Angels that have two MLB teams. There are many cities without any teams.
There used to be 8 teams. But, starting in the 2012 season, there are 10 teams.