Visit the official Usac 25 Website.  A great resource for rules, technical specs, national events, and much more. 

Hagerstown Quarter Midget Association, based in Hagerstown, MD. 

South Jersey Quarter Midget Association, located in New Egypt, NJ.

Lehigh Valley Quarter Midget Racing Club at Pocono Quarter Midget Raceway.

West End Quarter Midget Racing Association, located in Gilbert, PA.

Montgomery County Quarter Midget Racing Club, based in Phoenixville, PA.

Blackbird Quarter Midget Racing Club, located in New Castle, DE.

Keystone State Quarter Midget Race Club, located in Schnecksville, PA