Home > Tools > How can I apply for membership at Merrimack Valley Credit Union? Frequently Asked Questions Share On: [Knowledgebase Home] How can I apply for membership at Merrimack Valley Credit Union? To join Merrimack Valley call 800-356-0067, option 1, visit any one of our convenient branch locations, or print and fill out our member application. This answer has been viewed 1297 times. Related QuestionsCan I transfer funds from my account without having to come into a branch?What accounts can I access with Mobile Banking?What towns are in the Merrimack Valley Field of Membership?Who can join Merrimack Valley Credit Union?Can transfers be made using Mobile Banking?