99chambers

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

Maryland's 3rd District

A district of about 778,000 people, 53% of adults with a bachelor's degree. It votes D+24.8 relative to the nation for president.

Sarah Elfreth (D) · since Jan 3, 2025Next election Nov 7, 2028The 2026 race →
MD-3

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.

D+24.899th most
Democratic
Most DemocraticMost Republican218th seat · the majority line4785MD-3261

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. HouseD+20.5D+21.4D+34.0

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-3.

Adults with a bachelor's degree53% 93rd pct · 2nd of 8 in MD

Higher than 93% of seats.

White adults without a degree27% 31st pct · 4th of 8 in MD

Lower than 69% of seats.

Hispanic residents9% 36th pct · 4th of 8 in MD

Lower than 64% of seats.

Black residents17% 79th pct · 5th of 8 in MD

Higher than 79% of seats.

Asian residents11% 85th pct · 2nd of 8 in MD

Higher than 85% of seats.

People per square mile1,270 72nd pct · 4th of 8 in MD

Denser than 72% 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.

MA-8
53% college gradsD+29.3Held DMI-6
53% college gradsD+24.7Held DMN-3
52% college gradsD+21.6Held DMI-11
51% college gradsD+17.3Held 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. Sarah Elfreth (D)
    2025– · Won 2024 by 21.4, 2026 by 34.0
  2. John P. Sarbanes (D)
    2023–2025 · Won 2022 by 20.5

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