2020Final results
2020 election for Maryland's 1st District
U.S. House · Maryland
Andy Harris (R) won with 63.4% of the vote, defeating Mia Mason (D) by 27.1 points.
Andy HarrisRepublican · winner
63.4%250,901
Mia MasonDemocrat
36.4%143,877
395,524 votes
Source: MIT Election Data and Science LabUpdated Oct 1, 2026, 10:09 AM ET
The seat over time
D − R margin in this seat's races around 2020
Races before and after
Source: MIT Election Data and Science LabUpdated Oct 1, 2026, 10:09 AM ET
Money in this race
Each line compares the two campaigns on one scale.
Mia MasonAndy Harris
$2.5K
Raised by the campaign
$1.5M
$0
Spent by the campaign
$983.3K
$0
Cash on hand
$1M
Campaign money: FEC, through Jun 30, 2020; FEC, through Dec 31, 2020.
Source: FEC campaign filingsUpdated Dec 31, 2020