There's still quite a few A&W restaurants around in the US though they are rareish.

https://awrestaurants.com/locations-list/

400+ according to their wikipedia entry.

A&W is exceptionally rural now, and I'm not 100% sure why - it's a weird combination of fast food (drive thru) + waitress/sit down ordering that doesn't really exist anywhere else (kind of how there are a few carhop/drive UP restaurants that still exist).