The area of Treasure Island was originally settled in small communities by theTocobaga around 300 CE. TheTimucua traded with otherNative American tribes in the area until the arrival ofPánfilo de Narváez in 1528. De Narváez decimated the indigenous people before leaving the area in search of gold.[citation needed]
Treasure Island got its name early in the 20th century, after several property owners attempted to boost sales of the properties being developed on the island by first burying and then pretending to discover a couple of wooden chests on the beach around 1915. After claiming the chests were filled with treasure, the news of the discovery quickly spread and people began calling the island Treasure Island.[4]
With an elevation of only three feet, theGreat Gale of 1848 carved out John's Pass on the island's north end and split off two smaller islands, called the Isle of Palms and Isle of Capri.
Treasure Island saw a surge in residential and hotel construction followingWorld War II through the 1950s. The real estate used in these ventures often consisted of fill fromdredged material. Artificial extensions of the land were created, which were usually designed for convenient access to navigable waterways like Boca Ciega Bay.
According to theU.S. Census Bureau, the city has a total area of 5.3 square miles (13.8 km2), of which 1.6 square miles (4.1 km2) is land and 3.7 square miles (9.7 km2) (70.11%) is water.
Treasure Island has ahumid subtropical climate, closely bordering a tropical climate, resulting in warm, humid summers with frequent thunderstorms, and drier winters.
At the2000 census there were 7,450 people in 4,128 households, including 2,059 families, in the city. The population density was 4,679.0 inhabitants per square mile (1,806.6/km2). There were 5,694 housing units at an average density of 3,576.2 per square mile (1,380.8/km2). Theracial makeup of the city of the city was 97.69%White, 0.28%African American, 0.28%Native American, 0.59%Asian, 0.03%Pacific Islander, 0.43% fromother races, and 0.70% from two or more races.Hispanic orLatino of any race were 2.23% of the population.
Of the 4,128 households in 2000, 10.0% had children under the age of 18 living with them, 43.8% weremarried couples living together, 4.2% had a female householder with no husband present, and 50.1% were non-families. 41.5% of households were one person and 14.3% were one person aged 65 or older. The average household size was 1.80 and the average family size was 2.38.
The age distribution in 2000 was 9.2% under the age of 18, 2.7% from 18 to 24, 23.4% from 25 to 44, 38.5% from 45 to 64, and 26.3% 65 or older. The median age was 52 years. For every 100 females, there were 95.8 males. For every 100 females age 18 and over, there were 95.0 males.
In 2000, the median household income was $42,150 and the median family income was $64,158. Males had a median income of $38,903 versus $32,586 for females. Theper capita income for the city was $34,965. About 3.9% of families and 5.6% of the population were below thepoverty line, including 0.4% of those under age 18 and 6.9% of those age 65 or over.