Is Maryland considered a Middle Colony? Why or why not?

The Middle Colonies are New York, New Jersey, Pennsylvania, and Delaware. Maryland is considered a Chesapeake or Southern Colony. Historically, it has more in common with Virginia than it does New York or Pennsylvania.
The Middle Colonies are known for their successful agriculture and religious tolerance. The Middle Colonies also were not very dependent on slavery. Maryland had many slaves in order to work the large tobacco farms. Maryland remained a slave state until the Civil War.
Maryland's close ties to the South would continue well after the colonial period. During the Civil War, it was only through occupation that Lincoln was able to keep Maryland within the Union. Also, the mayor of Baltimore was arrested for speaking out against the war. While Maryland never really joined the Confederacy, many of her native sons died for the Confederate States.