UpdatedThu, Apr 29, 2021 at 2:04 pm ET Reply Massachusetts residents can sign up for an appointment by calling 1-888-503-0766 or signing up at the clinic's website. (Shutterstock) BARNSTABLE, MA — The town's health department, the Harbor Community Health Center and the Hyannis Fire Department have teamed up to open a coronavirus vaccine clinic at the Barnstable Adult Community Center for walk-ins. The clinic will use the Pfizer vaccine, meaning a second appointment will be required. Vaccines are available for anyone over 16. The community center is located at 825 Falmouth Road in Hyannis. Vaccinations are by appointment, and walk-ins are now welcome too from 9 to 11:45 a.m. and from 1 to 4 p.m., Monday through Friday.