United States Master's Swimming (USMS) - The national organization that provides organized swim practices, competitions, and clinics for adults 18 and over. USMS is open to all swimmers (fitness, triathlete, competitive and non-competitive) who want to improve their fitness and stroke technique
Colorado Masters Swimming Association (COMSA) - The local branch of USMS charged with regulating all masters swimming activities in the states of Colorado and Wyoming.
USA Swimming - As the National Governing Body for the sport of swimming in the United States, USA Swimming is a 300,000-member service organization that promotes the culture of swimming by creating opportunities for swimmers and coaches of all backgrounds to participate
Swimmer's Guide Online - Has an international database of accessible, full-size year-round pools