Martin County, Florida

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Martin County is a county located in the state of Florida. As of 2000, the population was 126,731. The U.S. Census Bureau 2005 estimate for the county is 139,728. Martin County is part of the Port St. Lucie Metropolitan Statistical Area. Its county seat is Stuart, Florida.

According to the U.S. Census Bureau, the county has a total area of 753 square miles (1,950 km²), of which, 556 square miles (1,439 km²) of it is land and 197 square miles (511 km²) of it is water, much of it in the Atlantic Ocean and Lake Okeechobee. The total area is 26.19% water. This makes it the 53rd largest county in Florida.

Martin County was created in 1925 with the present day Northwest and Northeast quadants coming from St, Lucie County and the Southwest and Southeast quadrants coming from Palm Beach County. It was named for John W. Martin, Governor of Florida from 1925 to 1929.