National Adult Baseball Association  
   NABA amateur baseball organization information, including tournament results, events and how to join.
   http://www.dugout.org/

Over 50 Baseball  
   Promoting an affordable week-long fantasy-camp type fun tournament in Las Vegas each October. Also promoting the establishment of local leagues nationwide.
   http://www.over50baseball.com/

Team One Baseball  
   Scouts baseball's high school, college and minor league players and compiles information on the annual Baseball Draft.
   http://teamonebaseball.rivals.com/

Roy Hobbs Adult Baseball  
   Amateur baseball organization for adults over the age of 28.
   http://royhobbs.com/

American Amateur Baseball Congress of Oklahoma  
   Features information on the organization including bylaws, links, officers, as well as state, regional, and world series tournament information.
   http://aabcoklahoma.com/

American Amateur Baseball Congress  
   Coordinates play among US leagues in seven age brackets, from sub-teens through adults. Includes rules, tournament dates, and list of regions and age divisions.
   http://www.aabc.us/

Vintage Base Ball Association  
   Listing of rules, tournaments, members and contact information.
   http://www.vbba.org

Ventura National Adult Baseball Association  
   League guide to teams for people age 18 and older. Features information on team play, current standings, newsletter, and game schedules for amateur organization.
   http://www.venturanaba.all-city.com/