Harford County Radio Control Modelers
- Radio control model aviation club site with information on activities and classified ads.
- http://www.hcrcm.com/

Harford County Soccer League
- Team standings, game schedules, directions to playing fields. (Affiliated with the Maryland State Youth Soccer Association.)
- http://www.hcsl.org/

Hartford County Men's Baseball League
- Adult team schedules, standings, rules, regulations, news and notes.
- http://www.harfordbaseball.com/

Harford County Amateur Radio Emergency Communications
- Trained amateur radio communicators organized to assist the community under ARES, RACES and SKYWARN systems. History, capabilities, activities, and other information.
- http://www.harfordemcomm.org/

KB3KAI
- David Stansbury's amateur radio site includes Harford County weather feeds, ham technical information, blog, and links to related resources.
- http://kb3kai.com

Harford Ski Club
- Ski and snowboarding trips to various locations. Monthly meetings in the local area.
- http://www.harfordskiclub.org/