The Maryland State Board of Elections has released voter registration data as of October 23, 2016. Percentages: Democratic 55.15%; Republican 26.01%; Libertarian .48%; Green .23%; independent and miscellaneous 18.13%.

Percentages in January 2016 were: Democratic 54.19%; Republican 25.86%; Libertarian .45%; Green .22%; independent and miscellaneous 19.28%.