[3] Martin County is in the Port St. Lucie, FL Metropolitan Statistical Area.

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.

Representatives from Palm Beach County later presented Representative Scott with a jug of water, signifying "all the water Bill Scott left Palm Beach County."

[7] The last renourishment of the Martin County Shore Protection Project was completed in May 2013 and included a Flood Control and Coastal Emergency component due impacts incurred with the passage of Hurricane Sandy in 2012.

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

Brightline officially announced that an infill station on the Treasure Coast would be built in Stuart and begin service by 2028.

The county commissioners are elected by county-wide vote, but each one represents a specific district.

[21] The school board is the legislative body of the district and also exercises quasi-judicial powers.

School Board members are elected county-wide but each one represents a specific district.

Martin County is a long-standing Republican stronghold, and as of 2024[update], has not supported a Democrat for the White House since Franklin Delano Roosevelt in 1944.