Stuart is a city and seat of Martin County, Florida. Located on Florida’s Atlantic East Coast known as the “Treasure Coast”, Stuart is the largest of four incorporated municipalities in Martin County. The estimated population of Stuart is 16,237 according to recent United States census estimates. Stuart is the 126th largest city in Florida based on official 2019 estimates from the US Census Bureau. Stuart is part of the Port St. Lucie, Florida Metropolitan Statistical Area.