Organizers
- Jameson 5K at Southwestern
- Jamestown Soccer Federation
- Jamesville-DeWitt Little League
- Jamia Alexander-Williams
- Jane Tomlinson's Run for All
- Janean Murphy Golf
- Janes World Inc, DBA as See Jane Run
- Janesville Area Crime Stoppers
- Janesville Athletic Club
- Janesville Soccer Club
- Janney Enrichment Program
- Janney+ Programs
- Japan Karate Institute North Charleston
- Jarden Westchester Triathlon
- Jarrod Grant Tennis School
- JAS Volleyball Inc.
- Jase Coburn Basketball Camp
- Jason Gardner Basketball Camps
- Jason Gooding
- Jason Schultz Golf
- Jason's Army
- Jasper Boys Soccer
- Jasper County Conservation
- Jasper Lions Club
- Jasper Sparks Softball
- Jasper Tennis Patrons
- JASWDC
- Jawor's Golf Center
- Jay Butler Basketball Camp
- Jaytech Baseball
- Jazz House Kids
- Jazz Night School
- JB Sports
- JBPHH MWR ATHLETICS
- JBSC
- JC Academy
- JC Enterprise
- JCC Manhattan
- JCC of Greater New Haven
- Jcc of Northern Virginia
- JCC Rainbow Day Camp
- JD Legends Volleyball Club
- JDL Consulting
- JDL Consulting, Inc.
- JDRF Triathalon-Mt Pleasant
- JDRF/Coloma River Races
- JD's Football School
- Jeanette Marcus, Tennis 4 U Tennis Para Ti Incorporated
- Jeff Baxter Volleyball Camps
- Jeff Billington Volleyball School
