Member Communities and Organizations:
- Town of Berwick, ME
- City of Dover, NH
- Town of Exeter, NH
- Town of Farmington, NH
- Town of Greenland, NH
- Town of Newington, NH
- Town of Newmarket, NH
- City of Portsmouth, NH
- City of Rochester, NH
- City of Somersworth, NH
- Town of Stratham, NH
- Strafford Regional Planning Commission
- Rockingham Planning Commission
- Strafford County Community Action Plan
- Pease Development Authority
- New Hampshire Department of Transportation (Bureau of Rail and Transit)
There are other organization COAST works with to provide or promote alternative modes of transportation. These organizations are not represented as Directors of COAST.
Other transportation providers:
- Lamprey Health Care
- Wildcat Transit (University of New Hampshire - Transportation Services)
- Northern New England Passenger Rail Authority (Amtrak Downeaster authority)
- C&J (interstate carrier: Dover/Durham/Portsmouth/Newburyport/Logan Airport/Boston/NYC)
- Seacoast Trolley
- SABR (Seacoast Area Bike Routes)
- First Student Transportation of Dover
Organizations relating to COAST service or which COAST is a member:
- Great Bay Community College
- Strafford County
- Crossroads House
- United Way of the Greater Seacoast
- New Hampshire Transit Association
Local Chambers of Commerce:
- Greater Dover Chamber of Commerce
- Greater Portsmouth Chamber of Commerce
- Greater Rochester Chamber of Commerce
- Greater Somersworth Chamber of Commerce
- Exeter Area Chamber of Commerce
Federal or State departments or statewide organizations:
- Federal Transit Administration
- New Hampshire Department of Transportation
- New Hampshire Department of Environmental Services
- Maine Department of Transportation