Here's a the beginning of a growing list of custom cutting board manufacturers from across the United States.
BigWood Boards - Atlanta, Georgia
Bletzacker's Woodshop - Columbus, Ohio
Bloodroot Blades - Athens, Georiga
Cooks Cutting Boards - Utah
Ed's Shape Shack - Greenville, North Carolina
Figure & Function Woodworks - San Diego, California
Hardwood Lumbar Company - Middlefield, Ohio
Jay Christy Design - Lubbock, Texas
JT Kodosky Woodworks - Helotes, Texas
Knotty's Woodwork - Toronto, Canada
MAC Cutting Boards - San Francisco, California
Mill Scale Metalworks - Lockhart, Texas
Offerman Woodshop - Los Angeles, California
Post Oak Customs - Austin, Texas
RoseWood Block & Co. - Little Rock, Arkansas
R & R Custom Workshop - Hughson, California
Salt Shaker Woodworks - Seguin, Texas
Two Acre Woodworks - Stratton, Colorado
Texas Butcher Blocks by Garwood - McKinney, Texas
Tuvy's Woodworking - McAllen, Texas
Unico Woodworks - Grand Praire, Texas
Unicorn Woodworks - Caldwell, Idaho
Vickers Woodshop & Wrenching - Lodi, California
Whiskey Boat Goods - Austin, Texas