The Mill Cities Relay is is an invitational event that is open to all members of the following clubs:
Founding Clubs of the Mill Cities Relay (1984):
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- Andover Striders
- Borderline Running Club
- Gate City Striders
- Gils Athletic Club
- Greater Derry Track Club
- Greater Lowell Road Runners
- Greater Manchester Running Club
- Melrose Running Club
- Merrimack Valley Striders
- Mystic Runners
- North Medford Club
- North Shore Striders
- Sandown Rogue Runners
- Shamrock Running Club
- Sole Sisters Running Club
- Somerville Road Runners
- Squannacook River Runners
- TriFury
- Whirlaway Racing Team
- Wicked Running Club
- Winner’s Circle Running Club