Brian J. Mast

Republican · FL-21 · U.S. House

Bio

Brian Jeffrey Mast is an American politician and veteran serving as the U.S. representative for Florida's 21st congressional district since 2017. The district, numbered as the 18th district before the 2020 redistricting cycle, includes the Treasure Coast and northern portions of Palm Beach County. He is a member of the Republican Party.

Full bio on Wikipedia →

Record of service

In office: 9.6 years
First took office: 2017 (5 terms)
Seniority: 167 of 437 by time served
Age: 46

District offices

Port St. Lucie, FL · 772-336-2877
Stuart, FL · 772-403-0900
Jupiter, FL · 561-530-7778
Fort Pierce, FL · 772-446-8855

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Service history, offices and identifiers from unitedstates/congress-legislators (public domain). Years served sum each term rather than subtracting the first start date, so a break in service is not counted as time in office.

Reported net worth

2019

$146k

2020

−$22k

2021

$200k

2022

−$1.7M

2023

$406k

2024

$551k

2025

$551k

Most recent filing (2025)

Assets: $600k – $1.3M
Liabilities: $250k – $500k
Net worth: $100k – $1.0M
Since 2019: +$404k

Largest holdings in the 2025 filing · 3 assets reported

4M Properties of South Florida, LLC$500k – $1.0M

USAA Checking and Savings Accounts$100k – $250k

Stay Salty Studios, LLC, 100% Interest$1 – $1k

Largest first, capped at 40 line items. Each is the asset's reported value bracket, not the income it produced.

From annual financial disclosures, which report every asset and debt as a bracket — so these are ranges, and the figure shown is their midpoint. A primary residence is not a reportable asset while its mortgage is a reportable debt, which pushes some members negative. How this is calculated →

Overall lean (DW-NOMINATE)

LeftCenterRight

Issue profile

Taxes & Fiscal

R+0.69

Healthcare

R+0.71

Immigration & Border

R+0.86

Guns

R+0.81

Abortion & Reproductive Rights

R+1.00

Environment & Energy

R+0.76

Crime & Policing

R+0.79

Defense & Veterans

R+0.60

Economy & Labor

R+0.74

Foreign Policy & Trade

R+0.72

Civil Rights & Social

R+0.35

Education

R+0.64

Government & Democracy

R+0.84

Judicial & Executive Nominations

R+1.00

Each issue runs left ↔ right, scored from how the member voted on bills tagged to that issue (−1…+1). Issues with too few votes are blank. Overall lean uses DW-NOMINATE.

How they score against the parties

Brian J. Mast's voting record compared with each party's national platform, issue by issue — the same similarity score used across the site.

93%Closest

65%

30%

21%

Democratic Socialists (DSA)

17%

Communist Party USA

16%

On the political map

Brian J. Mast (the large ringed dot) among every current member of Congress and the party platforms.

Party platforms:Communist Party USADemocratic Socialists (DSA)Green PartyDemocratic PartyRepublican PartyLibertarian Party

Each small dot is a current member (Dem · Rep); the larger dots are party platforms — click one for its closest members. Economic axis: taxes, healthcare, labor, energy. Social axis: abortion, guns, immigration, civil rights, crime.

Do you vote like Mast?

Answer a few questions on the issues and see which members of Congress — and which party — actually line up with you.

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Caucuses & committees

Where Mastsits in Congress's own organization — each group's lean is computed from its members' voting records. Explore them all on the caucuses and committees pages.

Caucuses

Republican Study Committeestrongly right · 139 members

Committees

House Committee on Foreign AffairsChaircenter · 50 members
House Committee on Transportation and Infrastructurecenter · 66 members
Aviation Coast Guard and Maritime Transportation Water Resources and Environment

Most and least aligned members

Treating Mast's 14 issue scores as a vector, cosine similarity measures whether two voting records point the same way (+100%) or in opposite directions (−100%) — the colleagues whose records align most and least with theirs.