The Interstate League served as a Class B league from 1939 until the advent of Television wiped out the league in 1952 (along with 2/3rds of the other leagues in the nation). Unlike most leagues that began during this time, the Interstate League was a high enough classification that it did not break for the war time effort. Nearly every team in the league held an affiliation to a Major League franchise. The Interstate League was based out of the mid-Atlantic region with franchises in Delaware, Maryland, Pennsylvania, Connecticut and New Jersey. Another Interstate League had played in the Ohio-West Virginia region in the early 20th century. That wasn't related to this one. However there was an Interstate League that was based out of Pennsyvania that played for 1 season in 1932, which was related to this league. Though it wouldn't make it past the one season due to the trials of the depression, it did lay the seeds for this future league to make a tremendous impact on the Minor League system a that time and produced such Hall of Famers as Nellie Fox, Robin Roberts and Willie Mays.

Island Park
Harrisburg Senators
1952-46 / 1942-39

Municipal Stadium
Hagerstown Owls
1951-1941
TRENTON NJ

Dunn Field
Trenton Packers
1950-1939
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READING PA

Laurer Park
Brooks/Chicks
1941-1940

Wilmington Park
Wilmington Blue Rocks
1952-1940
BRIDGEPORT CT

Newfield Park
Bridgeport Bees
1941
ALLENTOWN PA

Breadon Field
Allentown Cardinals
1952-1948
SALISBURY MD

Memorial Park
Salisbury Reds / A's
1952-1951
HAZELTON PA

Cranberry Park
Hazelton Mountaineers
1940-1939

Memorial Park
Sunbury Reds / A's
1952-1946 
Stumpf Field
Lancaster Red Roses
1953-1940
Memorial Park
York White Roses
1952-1947



Bicentennial Field
Allentown Cardinals
1948-1939
SUNBURY PA

Meredith Field
Sunbury Senators
1940-1939
YORK PA

West York Park
York White Roses
1946-1943

YORK PA

Parry Park
York Bees
1940