Then add all of those big and little Eastern dirt and asphalt ovals that are pre and just post WW2 that disappeared;
Langhorne
Trenton
Then locally near me:
Victoria
Pine Bowl
Route 66 (NY)
White's Beach
Empire
and lots more

But still going strong after 50 years or so:
Albany Saratoga (Malta-less then 5 miles)
Fonda Speedway NY (35 miles away)
Lebanon Valley NY (40 miles away)
Stafford Springs CT (100 miles)
Thompson CT (125 miles)

These are some of the tracks that I have frequented - and have even driven a couple of the smaller local tracks back in the flathead days