TrailNorth FCU offers membership to:
- Persons who live, work, worship, or attend school, or businesses and legal entities located in Essex, Washington, Warren, Clinton, and Franklin Counties in New York and Addison County in Vermont.
- Immediate family members of a person eligible for membership. An immediate family member is defined as a spouse, child, sibling, parent, grandparent, or grandchild. This would include step-parents, step-children, step-siblings, and adopted relationships.
- Eligibility also extends to unrelated persons who share a residence and who maintain a single economic unit. This includes any person who is a permanent member of and helps maintain the household.
- Organizations of such persons.