Here is a "short list" of sailmakers whom have spent efforts to ensure J/111 owners are competitive in both offshore handicap events as well as one-design events.
America's lofts- San Francisco, CA; Costa Mesa, CA; Miami, FL; St Petersburg, FL; Chicago, IL; Buzzards Bay, MA; Salem, MA; Traverse City, MI; E Greenwich, RI.
European lofts- Denmark, England, Germany, Italy, Netherlands, Spain
America's lofts- San Diego, CA; Milford, CT; Pewaukee, WI; Annapolis, MD; Halifax, Nova Scotia; Toronto, ONT, Canada;
Europe's lofts- Belgium; Southampton, England; Vannes (Brittany), France; Hamburg, Germany; Genoa, Italy; Netherlands;
American Lofts- Annapolis, MD; Chicago, IL; Detroit, MI; Long Beach, CA; Long Island, NY; Newport, RI; San Diego, CA; San Francisco, CA; Seabrook, TX; Seattle, WA; and Traverse City, MI.
European lofts- Denmark, Germany, France, Holland, Russia, Italy, Spain, Suisse
America's lofts- Newport Beach, CA; San Diego, CA; Seattle, WA; Annapolis, MD; Cleveland, OH; Rochester, NY; and Sarasota, FL
European lofts- Belgium; Denmark; England; France; Italy; Swede
UK/ Halsey Sailmakers
America's lofts- Annapolis, MD; Charleston, SC; Chicago, IL; Miami, FL; New York, NY; Houston, TX; Seattle, WA; San Francisco, CA; and Mystic, CT
Europe's Lofts- Benelux, England, France, Germany, Italy, Spain
They have lofts based in Southampton, England
They have lofts based in Southampton, England; Copenhagen, Denmark and Hague, The Netherleands
They have lofts based in La Rochelle, France; Le Havre, France and Marseilles, France
Ultimate Sails UK
They have lofts based in Southampton, England.