The American Collegiate Hockey Association (ACHA) began as a men's collegiate hockey league in 1991, and quickly grew to a league of over 150 teams in three men's divisions. The Women's Division 2 was added in 2006, and the ACHA currently boasts five divisions with over 375 teams from across the nation. Colleges are adding and dropping men's and women's teams each year so a specific number currently is unreliable. Just over 375 teams is a solid answer.