U.S. House seat · lines in effect since 2026
Florida's 21st District
A district of about 816,000 people, 36% of adults with a bachelor's degree. It votes R+14.8 relative to the nation for president.
Source: 2026 results: Florida Department of State, Division of Elections; 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.
Democratic
Labels below the bar mark 27 other seats in Florida.
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.
| 2016 | 2024 | 2026 | |
|---|---|---|---|
| U.S. Senate | R+8.6 | R+23.3 | No race |
| U.S. House | No race | No race | R+9.1 |
Outlined: the race for this seat itselfBlank: no race that year
Source: 99chambers results archive: precinct results allocated to current lines; 2026: Florida Department of State, Division of ElectionsUpdated 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 Florida. The black marker is FL-21.
Higher than 61% of seats.
Higher than 53% of seats.
Higher than 64% of seats.
Higher than 71% of seats.
Lower than 66% of seats.
Denser than 56% 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.
FL-836% college gradsR+15.2Held RFL-16
36% college gradsR+12.5Held RFL-11
23% Hispanic · 38% college gradsR+14.2Held RFL-7
22% Hispanic · 37% college gradsR+11.1Held R
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 2026.
- Brian Mast (R)
2027– · Won 2026 by 9.1
Source: Past results: 99chambers results archive (MEDSL, Klarner, state election offices)