Gateway International, IL
Green Valley Raceway, somewhere in the Dallas Metroplex (long time ago...)
Hallet Motor Racing Circuit, OK
Laguna Seca Raceway, CA
Las Vegas Motor Speedway, NV
Lime Rock Park, CT
Memphis Motorsport Park, TN
Mid-Ohio
Mosport Int'l, CN
Mt. View Motorsports Park, CO
Nelson Ledges, OH
Pocono Int'l, PA
Putnam Park, IN
Road Atlanta, GA
Sears Point, CA
Second Creek Raceway, CO
Summit Point, WV
Texas World Speedway, TX
Topeka Heartland Park, KS
Watkins Glen, NY

Temporary Circuits:

Abilene Regional Airport, Tx
Ardmore Airpark, OK
Big Springs, TX
Bryan's TAMU Riverside Circuit, TX
The old Greater Southwest Airport, Dallas (a left-over runway on the south end of the current D/FW airport. It might still be there!)
Houston Dragway, TX
Hutchinson Aerodrome, KS
Ponca City Grand Prix, OK

Tracks I want to run someday:

New Hampshire Int'l Speedway
Road America, WI

Tracks I WISH I had raced, but can no longer:

Bridgehampton, Long Island NY
Riverside, CA