Contact Concord Middle School Peabody Building 1231 Old Marlboro Road Concord, MA 01742 Phone: 978.318.1360 For directions, we suggest you use Google Maps. Contact Concord Middle School Sanborn Building 835 Old Marlboro Road Concord, MA 01742 Phone: 978.318.1380 For directions, we suggest you use Google Maps. Follow Concord Middle School Instagram: @Concord_MS Twitter: @CMS_ConcordMA