99chambers

U.S. House seat · lines in effect since 2022

Maryland's 1st District

A district of about 793,000 people, 35% of adults with a bachelor's degree. It votes R+16.3 relative to the nation for president.

Andy Harris (R) · since Jan 5, 2011Next election Nov 7, 2028The 2026 race →
MD-1

Source: 2026 results: civicAPI; boundaries: Census Bureau TIGER/LineUpdated Nov 7, 2026, 3:01 PM ET

Where it sits among all 435 seats

Every U.S. House seat by partisan lean, from most Democratic to most Republican. Lean is the seat's presidential vote on current lines, relative to the nation.

R+16.3287th most
Democratic
Most DemocraticMost Republican218th seat · the majority line4785326MD-1

Labels below the bar mark 7 other seats in Maryland.

Source: 99chambers: 2024 and 2020 presidential results on current lines, relative to the nation (2024 weighted 3:1)Updated Oct 16, 2026, 5:19 AM ET

Every race on these lines

Results recomputed from precinct returns as if today's boundaries had always existed, so years compare like for like.

202220242026
U.S. SenateNo raceR+36.9No race
U.S. HouseR+11.3R+22.0R+6.9

Outlined: the race for this seat itselfBlank: no race that year

Source: 99chambers results archive: precinct results allocated to current lines; 2026: civicAPIUpdated Nov 7, 2026, 3:01 PM ET

Who lives here, compared

Grey bars show the spread of all 435 seats. Small marks are other seats in Maryland. The black marker is MD-1.

Adults with a bachelor's degree35% 56th pct · 6th of 8 in MD

Higher than 56% of seats.

White adults without a degree48% 71st pct · 1st of 8 in MD

Higher than 71% of seats.

Hispanic residents6% 20th pct · 8th of 8 in MD

Lower than 80% of seats.

Black residents15% 74th pct · 7th of 8 in MD

Higher than 74% of seats.

Asian residents2% 35th pct · 8th of 8 in MD

Lower than 65% of seats.

People per square mile144 33rd pct · 8th of 8 in MD

Less dense than 67% of seats.

Source: Census Bureau, American Community Survey 2020–2024 5-year estimates, allocated to current linesUpdated Oct 13, 2026, 5:06 AM ET

Seats most like this one

Nearest seats on demographics, density and lean. 1 of the 4 flipped this year.

AR-2
20% Black · 34% college gradsR+14.9Held RNC-7
33% college gradsR+13.4Held RTN-7
37% college gradsR+21.4Held RNC-14
36% college gradsR+15.8Flipped D

Source: Census Bureau, American Community Survey 2020–2024 5-year estimates, allocated to current lines; 99chambers: 2024 and 2020 presidential results on current lines, relative to the nation (2024 weighted 3:1)Updated Oct 16, 2026, 5:19 AM ET

Who has held it

These lines took effect in 2022.

  1. Andy Harris (R)
    2023– · Won 2022 by 11.3, 2024 by 22.0, 2026 by 6.9

Source: Past results: 99chambers results archive (MEDSL, Klarner, state election offices)