I doubt there's anywhere you could mail your film that would beat that turn around time. All the usual suspects (Blue Moon, The Darkroom, Glass Key, etc.) can handle B&W sheet film readily enough, though.
Have you done a Google search for professional film labs near you? I live in the sticks in north central North Carolina, and the nearest one to me is a two hour drive in Charlotte -- and I haven't checked if they process film in house or can handle sheet film (I do all my film myself, anyway).
LTI Lightside in Manhattan. Pro developer
https://www.lti-lightside.com/ BW and color negative but no Chrome E6
For E6 CRC in NYC and other as well although I never tried them. Pro shop.
CRC - Pro Film Lab — Color Resource Center NYC Photo Lab
Need to develop your film? Interested in a bundle of process + scans or prints? CRC provides services for black and white, color and slide (E6) film for 35mm, 120, 220, 4x5, 8x10. We offer contact sheets, c-prints, inkjet prints, digital c-prints and more. Send in your film and we'll take care of thwww.colorresourcecenter.com
I've used North Coast Photo in CA as well for all types of film and was satisfied. Pro shop.
Film developing
Processing and Scanning Film from around the world. 35mm, 120mm, and Sheet film processing, C41, Black and White, and E6 color positive film. Located in Carlsbad, California.northcoastphoto.com
Check with them for the type of developer they use if you have a preference.
7-10 days is not an unusual turnaround time unless the lab is one that you can walk in and they process in-house. You'll certainly not be able to beat that by much if sending the film to a mail order place. Time in the mail, for me sending less than 100 miles away is 3 days going and about the same in return. The actual processing time at the lab for dev and basic scan is about 2 days.
Have you thought of processing yourself? I sent mine out for a long time and then the cost started to add up. The initial investment in basic processing equipment isn't small but easily amortized over a reasonable amount of time.
We process B&W film in our Jobo ATL 3. Sheet film mostly goes in Expert Drums or 2509n reels depending on the quantity. We use replenished XTol. Process only turnarounds are 3-5 business day. Dev + Scan are currently 5-7, and all scans are made with our Eversmart Supreme II. You can also opt to have your film processed in 510-Pyro.
If it's not clear from the user name, my lab is called Northeast Photographic. We're located in Bath, Maine. Can do 4x5 - 11x14 in C41, E6, or B&W.
I used to always do my own processing but the darkroom is now (?) kaput ...
Ilford also has a deal with a US based Lab, But I belive that is in California... http://www.harmanlab-us.com/
That's actually aka The Darkroom. They do good work, but mail time round trip from the East Coast to the Bay Area will equal the OP's existing local turn-around, and then you still add the actual processing or processing/scanning time.
I use a great lab in Plymouth, MA, if you're in the southern new england area. Message me if interested in this lab.
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