Instrument Makers
(Editor's note: There are far more instrument makers in the area than I ever expected.)
Guitars, Basses, Mandolins, Ukuleles
- Alembic, Santa Rosa
 - Ken Bebensee Stringed Instruments, North San Juan
 - Mark Berry Guitars, Cotati
 - Beyond The Trees / Fred Carlson, Santa Cruz
 - Bisceglia Guitars, San Jose
 - Blackbird Guitars, San Francisco
 - Blanchard Guitars, Los Gatos
 - Boulder Creek Guitars, Gilroy
 - Chandler Musical Instruments, Chico (apparently just pickguards now)
 - Ed Claxton Guitars, Santa Cruz
 - Dart Instruments, Philo
 - DMT Guitars, Potter Valley
 - Michael Dolan Custom Guitars, Santa Rosa
 - Joe Dragony Guitars, Carmichael
 - Dry Creek Guitars, Healdsburg
 - Fleishman Instruments, Sebastopol
 - Franklin Guitars, Ukiah
 - Scott French Musical Instruments, Auburn
 - Geiger Guitars, Carmel
 - Goodall Guitars, Fort Bragg
 - G. Gould Music, San Francisco (Modulus Guitars are now in Minnesota)
 - Grez Guitars, Petaluma
 - Halo Guitars, Cupertino
 - Hemken Guitars, Saint Helena
 - Hill Guitar Company, Ben Lomond
 - Hive Ukuleles, Santa Cruz
 - Kal Brand Music Co., Petaluma
 - Kauer Guitars, Elk Grove
 - Klein Guitars, Sonoma (no more)
 - Klepper Guitars, Berkeley
 - Randall Kramer Guitars, Truckee
 - Leach Guitars, Cedar Ridge
 - Maloney Stringed Instruments, El Sobrante
 - Matsuda Guitars, Redwood City
 - John F. Mello, Kensington
 - Michael Guitars, Palo Alto
 - Moonstone Guitars, Eureka
 - The Music Link (Recording King, The Loar, AXL Guitars, Johnson Guitars), Brisbane
 - Novax Guitars (moved to Eugene, Oregon)
 - Perlman Guitars, San Francisco
 - Prisma Guitars, San Francisco
 - Ribbecke Guitars, Ribbecke Guitar Company, Healdsburg
 - Saga Musical Instruments, South San Francisco
 - Santa Cruz Guitar Company, Santa Cruz
 - Schoenberg Guitars, Tiburon
 - Jason Z. Schroeder Guitars, Redding
 - Schroom Custom Guitar Works, Vallejo
 - Sexauer Guitars, Petaluma
 - Luthier Ervin Somogyi, Oakland
 - Steen Gutiars, Walnut Creek
 - Stephen Strahm Guitars, Santa Cruz
 - S3 Guitars, Palo Alto
 - Jeff Traugott Guitars, Santa Cruz
 - Rick Turner / Renaissance Guitars, Santa Cruz
 - Visionary Instruments, Oakland
 - Voyage Air Guitar, Livermore
 - Scott Walker Guitars, Santa Cruz
 - Wayne (Charvel) Guitars, Paradise
 - Yamamoto Guitar, Dublin
 - Zon Guitars, Redwood City
 
Bowed Strings
- Scott Cao Violins, Campbell
 - Fleishman Instruments, Sebastopol
 - Michael Hemken, Saint Helena
 - Maloney Stringed Instruments, El Sobrante
 - David Morse Violins, Soquel
 - Palo Alto Violins, Palo Alto
 - Jordan Music, Concord
 - Knutson Luthiery / Messenger Upright Electric Bass, Forestville
 - Saga Musical Instruments, South San Francisco
 - Zeta Violins (back in business, moved to Montana)
 
Synthesizers
- Buchla and Associates (Now Buchla Electronic Musical Instruments in Oregon)
 - Roger Linn Design Berkeley
 - Metasonix Vacuum Tube Synthesizers(!!!), Lakeport
 - MidiTaurus Bass Pedals Stockton
 - Tom Oberheim
 - Dave Smith Instruments San Francisco
 - Toppobrillo Oakland
 - Zerosum Intertia Lakeport
 
More
- Hollywood Winds, Fremont
 - John Phillips Harspichords, Berkeley
 - San Francisco Drum Company, San Francisco
 
Accessories
- Italia Straps, Marina
 - Jim Dunlop, Benicia
 - Gravity Picks, Mateca
 - HW Products, San Leandro
 - Dean Markley Strings, Santa Clara
 - Sfarzo Strings, Santa Rosa
 - Shubb Capos, Rohnert Park
 - Slidewinder Ring, San Francisco
 - Snareweight, South San Francisco
 - V-Picks (moved to Tennessee)