#1 in Credit Union Commercial Sales in Volume of Loans #2 in Credit Union Number of Loans. You’re eligible for membership Metro Credit Union if you live, work, go to school, or have a place of business in one of the counties listed below. Plus, if a family member is already a Metro member you can become a member too! Massachusetts: Barnstable, Bristol, Essex, Middlesex, Norfolk, Plymouth, Suffolk, Hampden, Hampshire, Franklin, and Worcester County New Hampshire: Rockingham, Hillsborough, and Cheshire County