OC and LA Vintage Sourcing Guide
I put together a list of my favorite places to look for vintage treasures, even though I secretly wanted to gatekeeping these. My philosophy for shopping vintage is to always keep an open mind. If you see something incredible, just snag it! You will find a home for it. 
6174 Santa Monica Blvd, Los Angeles, CA 90038
Incredible mid century pieces. Lots of treasure here! They have fun classics, unique upholstery, and good vintage chairs. The prices are reasonable and they are wonderful to work with.  
2416 E 16th St, Los Angeles, CA 90021
They have custom pieces as well as vintage. A great place if you are looking for sets of nightstands, dining chairs, etc. I've been dying to use this sofa in a project!
1600 Lincoln Blvd, Venice, CA 90291
A very large space with everything you could dream of - clothing, furniture, books, art, accessories, and more. It's a great space to wander. Every corner has a different feel. They have a mix of antique, vintage, and modern.
642 N Western Ave, Los Angeles, CA 90004
The showroom is gorgeous. It's very curated and great for higher end, rare pieces. They collect from a variety of eras. I especially love thier sofas, sectionals, and chairs. 
312 Old Newport Blvd, Newport Beach, CA 92663
This quaint shop is great for coastal homes. They have a good selection of art, accessories, and tableware. One of my favorite vintage finds is the yellow quilt shown above from Magnolia Mews. 
There are plenty more incredible places to source vintage. The Rose Bowl Flea and Long Beach Antique Market are always fun. I also love marketplace, Etsy,1stDibs and Charish. You never know where the next find is!