They may not fabricate anymore but I seem to remember from back in the day when I was a Ti geek that the Sandvik Special Metals plant in Washington State built many of the the own-brand Ti frames, including Kona, Marin, Diamond Back, GT Xizang etc.
Certainly what Kona said…(from a cached 2000-era webpage)
"Kona has been designing and selling Sandvik made 3-2.5 Titanium alloy frames for over 8 years"
"King Kahuna is made by Titanium Sports in Kennewick, Washington"
And Sandvik Special Metals is in Kennewick. IIRC Titanium Sports was SSM's fabrication devision.
http://209.85.229.132/search?q=cache:wVJAxvrUbZ0J:www.konaworld.com/TechArea/2000Tech/newtech4.html+sandvik+titanium+mountain+bikes&cd=2&hl=en&ct=clnk&gl=uk