I use the local Rite-Aid for processing, they are a Fuji shop, and as others have said it goes to Dwain's if it is E-6. They do C-41 in house and they do a nice job of processing, scanning, and printing C-41.
Something I have found strange is that they only do some services that Dwain's offers like E-6 process and mount or do not mount 120 or 35mm. They will not do Super 8 and if you want scans of slides they don't do that either. I have been told that it has something to do with the contract that Fuji has with Dwain's, honestly it doesn't bother me, they do nice work and I like to project my slides anyway. I can do E-6 at home, but I hate mounting slides myself.
B&W I process at home, it's just easier and way faster, people are always amazed when I take their photo soon after they arrive at my home and hand them a print before they leave without ever leaving the house.