There is no definitive answer to the question as there are multiple venues for lawsuits to be active in at any given time.
One would need to research the statistics for the state they are interested in and the type of lawsuit that one is referring to, ( civil suit for debt, personal injury, etc.).
240000
over 7,000,000
1263 law suits.
An American Bar Association study over 10 years ago put the number at 20 million.
There are no real lawsuits that are publicity mentioned from these schools. If they were filed they were probably settled out of court.
Minnesota
filed lawsuits
According to research there have been thousands of lawsuits filed on behalf of people affected by mesothlioma which is a rare type of cancer, believed to be caused by exposure to asbestos. There have been thousands of lawsuits filed, however it is unclear how many were related to nucear power plants in Eastern Canada.
1
500
It's hard to know exactly how many lawsuits are currently pending against tobacco companies because they are on different levels, i.e., state and federal. Generally, there are around 5,000 to 10,000 lawsuits filed against tobacco companies each year.
LULAC challenged segregation in public schools by filing lawsuits.