There are a few in my area. Off the top of my head Aftelier (Mandy Aftel), Yosh Han, Lord's Jester...I'll add the others as they come to me. 1rst 2 are in the SF Bay Area. They have perfume lines, but they will also do custom scents. I smelled one that Mandy did for Madonna! I can't afford to have a custom scent made for me at this time.
* Velvet and Sweet Pea's, Sarah Horowitz, and Evalux as well as DSH I'm not sure, but possibly. They're all natural or mostly natural perfumers. A Canadian perfumer who I would love to have a custom scent from is Ayala Moriel. I love her point of view.