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Martin County, Florida facts for kids

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Martin County
Martin County Courthouse
Martin County Courthouse
Official seal of Martin County
Map of Florida highlighting Martin County
Location within the U.S. state of Florida
Map of the United States highlighting Florida
Florida's location within the U.S.
Country  United States
State  Florida
Founded May 30, 1925
Named for John W. Martin
Seat Stuart
Largest community Palm City
 • Total 753 sq mi (1,950 km2)
 • Land 543 sq mi (1,410 km2)
 • Water 209 sq mi (540 km2)  27.8%%
 • Total 158,431
 • Density 295/sq mi (114/km2)
Time zone UTC−5 (Eastern)
 • Summer (DST) UTC−4 (EDT)
Congressional district 18th
Roosevelt Bridge, Stuart, Florida 001
The new Roosevelt Bridge

Martin County is a county located in the Treasure Coast region 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.


Martin County was created in 1925 with the northern portion coming from St. Lucie County and southern portion coming from Palm Beach County. It was named for John W. Martin, Governor of Florida from 1925 to 1929.

When the county was created, the western contour followed the shore of Lake Okeechobee, as did the borders of Glades, Okeechobee, and Hendry counties. Palm Beach County had historically claimed all of the surface of the lake as part of its area, to its benefit for the distribution of state and federal highway funds. The state representative of Martin County, William Ralph Scott of Stuart, initiated a bill to divide the lake among its adjacent counties, creating a more equitable distribution of state funds for road creation and maintenance. All bordering counties confirmed the justice of this change and supported its ratification, with the exception of Palm Beach County. Representatives from Palm Beach County later presented Representative William Scott with a jug of water, signifying "all the water Bill Scott left Palm Beach County." The jug is in the possession of Stuart Heritage.


According to the U.S. Census Bureau, the county has a total area of 753 square miles (1,950 km2), of which 543 square miles (1,410 km2) is land and (27.8%) is water. It is the fifth-largest county in Florida by land area, and fifty-third largest by total area.

Adjacent counties

National protected area

  • Hobe Sound National Wildlife Refuge


Historical population
Census Pop.
1930 5,111
1940 6,295 23.2%
1950 7,807 24.0%
1960 16,932 116.9%
1970 28,035 65.6%
1980 64,014 128.3%
1990 100,900 57.6%
2000 126,731 25.6%
2010 146,318 15.5%
2020 158,431 8.3%
U.S. Decennial Census
1790-1960 1900-1990
1990-2000 2010-2019

2020 census

Martin County racial composition
(Hispanics excluded from racial categories)
(NH = Non-Hispanic)
Race Pop 2010 Pop 2020 % 2010 % 2020
White (NH) 117,532 119,216 80.33% 75.25%
Black or African American (NH) 7,493 7,277 5.12% 4.59%
Native American or Alaska Native (NH) 248 218 0.17% 0.14%
Asian (NH) 1,510 2,246 1.03% 1.42%
Pacific Islander (NH) 52 42 0.04% 0.03%
Some Other Race (NH) 139 525 0.09% 0.33%
Mixed/Multi-Racial (NH) 1,463 4,720 1.0% 2.98%
Hispanic or Latino 17,881 24,187 12.22% 15.27%
Total 146,318 158,431

As of the 2020 United States census, there were 158,431 people, 65,014 households, and 40,328 families residing in the county.



  • Indiantown Airport
  • Naked Lady Ranch Airport (private)
  • Witham Field

Major highways


The Lake Okeechobee Scenic Trail, a segment of the Florida National Scenic Trail, passes through Martin County.


The Martin County Library System has 7 branches.

  • Blake Library
  • Elizabeth Lahti Library
  • Hobe Sound Public Library
  • Hoke Library
  • Peter & Julie Cummings Library
  • Robert Morgade Library
  • Law Library


Florida panther at Audubon Center, Stuart, Florida
Florida panther at Possum Long, September, 1992

Historic areas

On the National Register of Historic Places:

Other historic areas listed in 1989 by the Florida Chapter of the American Institute of Architects:

  • All Saints Episcopal Church, Waveland, 2377 N.E. Patrician Street, 1898,
  • Bay Tree Lodge (Kiplinger House), 143 S. River Road (originally 104 S. Sewall's Point Road), Sewall's Point, 1909
  • Dudley-Bessey House, 110 S.W. Atlanta Avenue, Stuart, 1909
  • Dyer Homestead, 1006 S.W. St. Lucie Crescent, Stuart, 1904
  • Feroe Building, 73 S.W. Flagler Avenue, corner of St. Lucie, Stuart, 1913
  • France Apartments, 524 St. Lucie Crescent, Stuart, 1927
  • Golden Gate Building, 3225 S.E. Dixie Highway in Golden Gate south of Stuart, 1925
  • Kitching House, 210 S.W. Atlanta Avenue, Stuart, 1894
  • Stuart Feed Store, 101 S.W. Flagler Avenue, Stuart, 1905
  • Sunrise Inn, S.E. Old St. Lucie Boulevard, Port Sewall. ca. 1925 (demolished)
  • John E. Taylor House, 204 S.E. Atlanta Avenue, Stuart, 1914

Other places listed in 2012 by the Florida Chapter of the American Institute of Architects in its Florida Architecture: 100 Years. 100 Places.

  • Beach Road 2, Jupiter Island


Downtown Stuart, in the heart of the county seat



Census-designated places

Sunset from the Intracoastal Waterway at Hobe Sound

Other unincorporated places


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