US Optimist Dinghy Association - All about the USODA, membership list, local results, events calendar, gear exchange, and who/what/where information. - http://www.usoda.org/
Irish Optimist Association - Introduction by the President of IODAI, news, events, information package, photographs, archives, items for sale, and message board are included. - http://www.iodai.com/
Bermuda Optimist Dinghy Association - Offers, racing results, news, upcoming events, photo gallery, and contact information. - http://www.boda.bm
International Optimist Dinghy Association - The home base for Optimist enthusiasts, with information about the class, regatta information, and links to other Opti sites. - http://www.optiworld.org/