According to the United States Census Bureau, the Iona CDP has a total area of 10.2 square miles (26.5 km2), of which 6.6 square miles (17.1 km2) are land and 3.6 square miles (9.4 km2), or 35.32%, are water, primarily in the Caloosahatchee River estuary.[6]
As of the census[2] of 2000, there were 11,756 people, 6,023 households, and 3,740 families residing in the CDP. The population density was 1,648.5 inhabitants per square mile (636.5/km2). There were 9,290 housing units at an average density of 1,302.7 per square mile (503.0/km2). The racial makeup of the CDP was 97.47% White, 0.41% African American, 0.17% Native American, 0.48% Asian, 0.01% Pacific Islander, 0.83% from other races, and 0.63% from two or more races. Hispanic or Latino of any race were 3.94% of the population.
There were 6,023 households, out of which 11.2% had children under the age of 18 living with them, 54.9% were married couples living together, 5.1% had a female householder with no husband present, and 37.9% were non-families. 31.4% of all households were made up of individuals, and 17.0% had someone living alone who was 65 years of age or older. The average household size was 1.95 and the average family size was 2.36.
In the CDP, the population was spread out, with 10.2% under the age of 18, 3.6% from 18 to 24, 17.6% from 25 to 44, 29.1% from 45 to 64, and 39.5% who were 65 years of age or older. The median age was 59 years. For every 100 females, there were 91.5 males. For every 100 females age 18 and over, there were 90.2 males.
The median income for a household in the CDP was $37,091, and the median income for a family was $46,250. Males had a median income of $34,740 versus $25,683 for females. The per capita income for the CDP was $33,937. About 5.9% of families and 10.0% of the population were below the poverty line, including 17.6% of those under age 18 and 4.7% of those age 65 or over.
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