Martin County
Also known as Martin County, Florida, Martin County, FL
county in Florida, United States
Key facts
- Country
- United States
- State
- Florida
- Founded
- May 30, 1925
- Named after
- John W. Martin
- Seat
- Stuart
- Largest community
- Palm City
- Total
- 753 sq mi (1,950 km )
- Land
- 543 sq mi (1,410 km )
- Water
- 209 sq mi (540 km ) 27.8%
- Estimate 2025
- 166,272
- Density
- 292/sq mi (113/km )
- Time zone
- UTC−5 ( Eastern )
- Summer dst
- UTC−4 ( EDT )
~12 min read
Article
Roosevelt Bridge and Stuart City
Martin County is a county located in the southeastern part of the state of Florida, in the United States. As of the 2020 census, the population was 158,431. Its county seat is Stuart. Martin County is in the Port St. Lucie, FL Metropolitan Statistical Area.