I don't know about nationally notable, but the latest intriguing 9-hole course built in the Boston area is called the Harmon Club, and was built in about 2003.
The club, located in Rockland on the So. Shore, is a "championship 9" that stretches close to 7000 for two loops from the tips. It's owned or managed by the Harmon brothers, and I imagine there may be others in other cities in the Northeast. The facility is private, though generally affordable (minimal initiation, something like $5K, yearly dues are something like $1-2K), and has a full-scale practice area with launch monitors, a teaching staff, a restaurant, and a full service locker room. I have not played the course myself, but I have heard it isn't bad.
This is the only one that currently comes to mind up here in the Northeast.