• Blackberry Ridge Woolen Mill
• Frankenmuth Woolen Mill
• Ohio Valley Natural Fibers
• Ozark Carding Mil
• Taos Valley Wool Mill
• Zeilingers Wool Co.
  
     IN MAINE
  
• Bartlett Yarns
• Done Roving Farm & Carding Mill
• Friends Folly Farm (for small runs of natural fibers)
• Starcroft Fiber Mill
  Grant & Jani Estell
  83 Pattee Road
  Monroe, ME 04951
  (207) 525-3562;  starcroft@acadia.net
• Wood-Stock Farm Carding Mill 
  Bud & Val Weiland
  618 Western Avenue
  Hampden, Maine 04444-1030
  (207) 862-4078; wool1@hamtel.tds.net

Another list of fiber processing companies (off-site)

And... another list (also off site).

And...another list (also off-site).