The following groups are involved with rail trails and have participated in NHRTC activities:

Bike-Walk Alliance of New Hampshire:
Brookline Conservation Commission:
Central New Hampshire Regional Planning Commission:
Derry Rail Trail Alliance:
East Coast Greenway:  
Friends of the Goffstown Rail Trail:  
Friends of the Northern Rail Trail in Grafton County:
Friends of the Northern Rail Trail in Merrimack County:  
Hooksett Kiwanis:
Mascoma River Greeway:  
Manchester Moves:
Merrimack River Greenway Trail
Milford Conservation Commission:
National Parks Service Rivers and Trails Program:
New Hampshire Bureau of Trails:
New Hampshire Department of Transportation:
Ordway Park Committee:
Pathways for Keene:
Rockingham Planning Commission:
Salem Conservation Commission:
Southern New Hampshire Planning Commission
Town of Swanzey:  
Windham Rail Trail Alliance:
WOW Trail: