Biden easily carried Maryland with 65.4% of the vote to Trump's 32.2% (a margin of 33.2%, significantly larger than Hillary Clinton's 26.4% in 2016). Prior to the election, all news organizations projecting the election considered Maryland a state that Biden would carry comfortably. Maryland has long been a Democratic-leaning state, and no Republican presidential candidate has won it since George H. W. Bush in 1988. Biden carried the Black-majority, suburban counties of Prince George's County and Charles County with over 80% and 60% of the vote respectively, Baltimore City with almost 90% of the vote, and the white-majority, suburban counties of Montgomery, Howard, and Baltimore with over 60% each. While Republicans typically win more counties by running up margins in more rural western Maryland and the Eastern Shore, the Baltimore-Washington area casts over three-fourths of the state's vote, making it difficult for a Republican to carry Maryland. While Trump won 14 of Maryland's 24 county-level jurisdictions, Biden won the six largest, all of which are part of the Baltimore-Washington area–Montgomery, Prince George's, Anne Arundel, Howard and Baltimore counties and Baltimore City–by over a million votes collectively, more than enough to carry the state.
Per exit polls by the Associated Press, Biden's principal strength in Maryland came from winning 94% of African-Americans, who represented 28% of the electorate. 74% of voters believed the criminal justice system needed a complete overhaul or major changes, and they opted for Biden by 73%. Biden won all other major demographic groups, including 52% of Whites (the first time since 1964 that a Democratic candidate won the white vote in Maryland), 69% of Latinos, 79% of Jews, 54% of Protestants, and 51% of Catholics.[4]
Biden flipped Frederick County in the Washington, D.C., exurbs and Talbot County on the Eastern Shore Democratic for the first time since 1964.[5] He also flipped Kent County on the Eastern Shore, home of Washington College, Democratic for the first time since 2008. In another college county on the Eastern Shore, Wicomico (home of Salisbury University), Trump won but was held below 50% of the vote for the first time for a Republican nominee since 1996.