In the 2020 election, Frederick County flipped from Republican to Democratic.

Comparing 2020 to 2016, Frederick County saw a 4.9% decline in the number of votes for the Republican party candidate for president, while there was a nearly 10% increase in the number of votes for the Democratic party candidate.

The Maryland Board of Election marks the 2020 results as unofficial while ballots continue to be counted. Data is published with 74% reporting.
Chart: Amina Lampkin Source: Maryland State Board of Elections