MD is not right to work state.
"While Maryland has no explicit right-to-work law on the books, Section 4-304 of the state’s Labor and Employment Code prohibits any promise between (prospective) employees and (prospective) employers or any other party if the promise requires either party: To join or remain a member of a labor organization; Not to join or not to remain a member of a labor organization; or To withdraw from an employment relation if the party joins or remains a member of a labor organization. - See more at: http://statelaws.findlaw.com/maryland-law/maryland-right-to-work-laws.html#sthash.0ReYZdOx.dpuf"
It seems like somehow MD is as same as right to work state.
If you want to know if you are eligible for unemployment in Maryland, this link could help you:
http://www.nolo.com/legal-encyclopedia/collecting-unemployment-benefits-maryland.html