Leaving aside Austin, which has various issues, the only North American permanent, natural-terrain, road courses that I can confidently say are, right now, up to IndyCar's standards, are Road America, Mid Ohio, Watkins Glen, Barber, Sears Point (in a rather neutered form), Laguna Seca, and Mexico City.
The racing isn't that great on the layout of Sears Point the series uses. I'm not convinced that the racing would be that good at the reconfigured Mexico City, either.
All the other road courses not mentioned here would probably need added debris fencing, at least.
Also, this leaves a rather large part of the country without a major road race even remotely nearby.
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