how far are you willing to travel? For dirt oval I found turkey trot raceway 126 miles from mass in my database, but I'm only about halfway through uploading the data, so hopefully more might popup for you:
http://www.kartpulse.com/directory/
Here's the top results from nearest to farthest, dirt oval tracks only...
Turkey Trot Raceway
Thu at 10:45 PM 0 likes, 0 connections, 0 comments, 1 view
Location: Turkey Trot Raceway, 1322 Mahaffy Road, Fort Edward, NY, 12828, USA - Get Directions
approximately 126.54 miles
Dirt oval gokart, kart racing and karting, Fort Edward, NY
Caroga Creek Raceway
Thu at 10:45 PM 0 likes, 0 connections, 0 comments, 1 view
Location: Caroga Creek Raceway, 4200 New York 10, St. Johnsville, NY, 13452, USA - Get Directions
approximately 165.55 miles
Dirt oval gokart, kart racing and karting, St. Johnsville, NY
Oakland Valley Speedway
Thu at 10:45 PM 0 likes, 0 connections, 0 comments, 1 view
Location: Oakland Valley Speedway, 305 Okland Valley Road, Cuddebackville, NY, 12729, USA - Get Directions
approximately 177.55 miles
Dirt oval gokart, kart racing and karting, Cuddebackville, NY