Stuart is a city in, and the seat of, Martin County, Florida, United States. Located on Florida’s Treasure Coast, Stuart is the largest of four incorporated municipalities in Martin County. The population was 15,593 in the 2010 census. It is part of the Port St. Lucie, Florida Metropolitan Statistical Area.
Stuart is frequently cited as one of the best small towns to visit in the U.S., in large part because of its proximity to the St. Lucie River and Indian River Lagoon.
Stuart has a tropical climate closely bordering on a humid subtropical climate with hot, humid summers, with frequent rainfall, and warm, dry winters. Located near the northern end of a true tropical climate, Stuart has a noticeably seasonal precipitation pattern, with June through September being the wettest months, and the dry season from November through April.

As of the census of 2010, there were 15,593 people, 7,220 households, and 3,422 families residing in the city. The population density was 2,320.5 per square mile (896.0/km2). There were 8,777 housing units at an average density of 1,391.9 per square mile (537.4/km2). The racial makeup of the city was 83.30% White, 12.33% African American, 0.26% Native American, 0.66% Asian, 0.03% Pacific Islander, 1.97% from other races, and 1.46% from two or more races. Hispanic or Latino of any race were 6.29% of the population.
There were 7,220 households out of which 15.0% had children under the age of 18 living with them, 34.7% were married couples living together, 9.7% had a female householder with no husband present, and 52.6% were non-families. 46.1% of all households were made up of individuals and 26.1% had someone living alone who was 65 years of age or older. The average household size was 1.88 and the average family size was 2.60.
In the city, the population was spread out with 14.5% under the age of 18, 6.9% from 18 to 24, 24.5% from 25 to 44, 21.2% from 45 to 64, and 32.9% who were 65 years of age or older. The median age was 48 years. For every 100 females there were 87.8 males. For every 100 females age 18 and over, there were 84.4 males.