Columbia Amateur Radio Association
- Serves Howard County and site includes activity schedule, repeater list, newsletter archive, satellite information.
- http://www.columbiaara.org/

Columbia Gymnastics
- Competitive and recreational programs for boys and girls. Features information on programs and services, registration and tuition, schedules, summer camps and classes, and contact information.
- http://www.columbiagymnastics.com/

Red Fern Budokai
- Independent dojo offering Aikido instruction. Class schedule, instructor biography, announcements, and downloadable dojo forms.
- http://www.aikidimension.com/

Columbia Scuba
- Store hours, contact information and details on various levels of PADI certification courses.
- http://www.columbiascuba.com/

Columbia Triathlon Association
- A non-profit association that supports triathlon, duathlon and multisport athletes through race sponsorship and results, social events, online forum.
- http://www.tricolumbia.org/

Earth Treks Climbing Center
- Calendar of events, class information, photo gallery and information on group and corporate programs.
- http://www.earthtreksclimbing.com

Columbia Ski Club
- Includes membership information, activities list, photos, and mailing list signup.
- http://www.columbiaskiclub.org/

Jow Ga Kung Fu Athletic Association
- School information, schedule of special events.
- http://www.jowtigers.com/