The New York City public courts in Forest Park, Queens USED to have real red european clay. I lived in Forest Hills thru High School and they had 11 (maybe 10) public courts and the stuff was AWESOME. I understand that all are now hard and the Red stuff has been gone for quite some time - Also up on the upper Westside along the river when i drive thru New York every few weeks for business I still see a batch of Red Clay Public courts.
Here in Houston the River Oaks CC used to have Red clay that was imported from Italy a few years ago but they switched to the Red American Clay that is sold by Lee Tennis (Har Tru folks). Same Red stuff you see at Crandon Park in Miami. I also remember that in Metarie, LA the public facility had Har Tru but that was pre Katrina and I dont think the facility has been even been rebuilt.