City of Boston Credit Union 77 Spring St, West Roxbury, MA02132 Since 1915, City of Boston Credit Union has provided personal financing service and assurance for Boston and its…More surrounding areas. To become a member, just deposit $25, and you will officially own a share of the Union. This gives you equal standing on making Credit Union decisions; membership is not dependent on how much you have put into your checking or savings account. For futher information, visit a branch and speak with one of the representatives. There are additional locations in Boston's financial district and in Dorchester.