15 stadiums were used during the 1943 MLB season. Isolated games and short term temporary home fields are not necessarily included.
Other baseball leagues in 1943:
1911-1960
Nationals
(MLB)
1912-1970
Reds
(MLB)
1912-1999
Tigers
(MLB)
1913-1957
Dodgers
(MLB)
1911-1957
Giants
(MLB)
1910-1946
Indians
(MLB)
1923-2008
Yankees
(MLB)
1915-1952
Braves
(MLB)
1909-1970
Pirates
(MLB)
1912-2021
Red Sox
(MLB)
1916-2021
Cubs
(MLB)
1938-1993
Indians
(MLB)
1910-1990
White Sox
(MLB)
I sincerely appreciate the research work, and the information being shared. It is important and interesting history.