- According to the team's training camp guide, Billy Smith wore #66 in the 1973-74 Islander training camp. (Gerry Desjardins was listed as #65, and Chico Resch was #86.)
- Gilles Thibaudeau wore the number in the Isles 1989-1990 Yearbook. When the regular season started, Thibaudeau wore #38.
(Thibaudeau was only with the team until a December 20th trade with Toronto brought Jack Capuano into the Islander organization for the first time. Cappy never appeared for the Isles, and after playing 14 games for Springfield, was traded to Vancouver)