American Running Association - Non-profit organization encourages people of all ages to promote better health through walking and jogging. Offers educational programs, and motivational advice for maintaining an active and healthy lifestyle.
Atlanta Track Club - Non-profit organization promotes health and fitness, offers amateur road racing, cross-country, and track & field programs including Atlanta Marathon and Half Marathon.
Blackmores Sydney Marathon - Provides information on Marathon (42km), Half Marathon (21km), Bridge Run (9km), and Family Fun Run (3.8km) races. Includes details on registration, race day events, and results.
Boston Athletic Associaton - Official Boston Marathon and Half Marathon website provides online registration, event information, running tips and course details.
Chicago Marathon - Official website provides course information, race history archives including US & World records, fitness, and training information.
Dallas White Rock Marathon - Organizes Dallas White Rock Marathon, Half Marathon, and 5-Person Relay. Offers online registration, race details, newsletters, and personalized marathon commemoratives.