|Collier County and the state of Florida|
|• Total||1.5 sq mi (3.8 km2)|
|• Land||1.5 sq mi (3.8 km2)|
|• Water||0 sq mi (0 km2)|
|Elevation||7 ft (2 m)|
|• Density||2,571.3/sq mi (1,015/km2)|
|Time zone||Eastern (EST) (UTC-5)|
|• Summer (DST)||EDT (UTC-4)|
|GNIS feature ID||1867168|
Lely is located at .(26.102802, -81.733125)
According to the United States Census Bureau, the CDP has a total area of 1.5 square miles (3.9 km2), of which, 1.5 square miles (3.9 km2) of it is land and 0.68% is water.
As of the census of 2000, there were 3,857 people, 2,037 households, and 1,179 families residing in the CDP. The population density was 2,638.9 people per square mile (1,020.0/km²). There were 2,641 housing units at an average density of 1,806.9/sq mi (698.4/km²). The racial makeup of the CDP was 97.41% White, 0.70% African American, 0.16% Native American, 0.44% Asian, 0.91% from other races, and 0.39% from two or more races. Hispanic or Latino of any race were 3.71% of the population.
There were 2,037 households out of which 8.7% had children under the age of 18 living with them, 52.7% were married couples living together, 3.8% had a female householder with no husband present, and 42.1% were non-families. 37.8% of all households were made up of individuals and 26.3% had someone living alone who was 65 years of age or older. The average household size was 1.82 and the average family size was 2.33.
In the CDP the population was spread out with 8.1% under the age of 18, 2.8% from 18 to 24, 13.1% from 25 to 44, 25.8% from 45 to 64, and 50.2% who were 65 years of age or older. The median age was 65 years. For every 100 females there were 82.2 males. For every 100 females age 18 and over, there were 80.2 males.
The median income for a household in the CDP was $45,170, and the median income for a family was $57,361. Males had a median income of $40,719 versus $31,139 for females. The per capita income for the CDP was $32,430. About 5.1% of families and 6.3% of the population were below the poverty line, including 6.2% of those under age 18 and 8.9% of those age 65 or over.