Depends on what county you want to do it in for Maryland. The Baltimore area EMT courses are all in the state community colleges. The classes are about a semester, I'm sure you can probably find a summer course. I did mine at CCBC over the Fall semester. It was great! I think in PG County you have to do them through a volunteer FD (not 100% sure about this). I would just google based on location you prefer to take the course in. If you join a Volunteer FD/EMS they might pay for your class and costs associated with licensing. Its also a great way to get experience in a 911 system. Again, just google to find departments near you and contact them.
Another place to check for info is the MIEMMS website, which is the state EMS organization and specifically in charge of EMT courses and licensing, or MFRI, which is the state Fire/ Rescue training organization.