It may be incomplete, and there also may be some inconsistencies due to occasional contradictory information between articles.
For the 1950 season, the organization was renamed Nippon Professional Baseball and with additional clubs joining, it was broken into the Central League (CL) and the Pacific League (PL).
The team list is confined to top-level professional clubs.
The stadium list also includes some university-level clubs, where known.
This is a partial list of clubs that were in the JBL and which disbanded or merged.