Welcome to the Sumner County Clerk’s Website. You will find useful information about the services our office offers to customers. If you are unable to find the answer to your particular question, please feel free to contact us at 615-452-4063. Not located in MA? Choose your state: RI, NY All Massachusetts AAA branches offer RMV services for our members, even on Saturdays.* Most Massachusetts Registry services – including license and registration renewals – can be started online to save you time.