The Howard County Conservancy
- A land trust founded to help preserve the natural environment, agricultural resources, and unique historic sites. Includes news, conservation information, history, education programs and volunteering opportunities.
- http://www.hcconservancy.org/

The Blandair Foundation
- Carries out historic and urban open space management research while preserving Blandair Farm, a 300-acre property in Howard County, Maryland. Includes proposal for the applied urban ecology project.
- http://www.blandair.org/

Sierra Club Howard County
- A local chapter of the national environmental organization. Includes programs, newsletter, outings, photos, and upcoming legislative meetings.
- http://maryland.sierraclub.org/hc/