|Lee County and the state of Florida|
|• Total||18.8 sq mi (48.7 km2)|
|• Land||18 sq mi (46.5 km2)|
|• Water||0.8 sq mi (2.2 km2)|
|Elevation||16 ft (5 m)|
|• Density||116.1/sq mi (44.8/km2)|
|Time zone||Eastern (EST) (UTC-5)|
|• Summer (DST)||EDT (UTC-4)|
|GNIS feature ID||0277830|
Alva is located at .
According to the United States Census Bureau, the CDP has a total area of 18.8 square miles (49 km2), of which, 18.0 square miles (47 km2) of it is land and 0.8 square miles (2.1 km2) of it (4.47%) is water.
As of the census of 2000, there were 2,182 people, 912 households, and 673 families residing in the CDP. The population density was 121.5 people per square mile (46.9/km²). There were 1,017 housing units at an average density of 56.7/sq mi (21.9/km²). The racial makeup of the CDP was 96.33% White, 0.18% African American, 0.32% Native American, 0.18% Asian, 0.14% Pacific Islander, 1.24% from other races, and 1.60% from two or more races. Hispanic or Latino of any race were 2.89% of the population.
There were 912 households out of which 22.7% had children under the age of 18 living with them, 64.9% were married couples living together, 5.9% had a female householder with no husband present, and 26.2% were non-families. 21.5% of all households were made up of individuals and 12.4% had someone living alone who was 65 years of age or older. The average household size was 2.39 and the average family size was 2.73.
In the CDP the population was spread out with 18.9% under the age of 18, 4.1% from 18 to 24, 22.1% from 25 to 44, 31.7% from 45 to 64, and 23.2% who were 65 years of age or older. The median age was 48 years. For every 100 females there were 96.9 males. For every 100 females age 18 and over, there were 96.1 males.
The median income for a household in the CDP was $41,938, and the median income for a family was $48,073. Males had a median income of $35,300 versus $25,656 for females. The per capita income for the CDP was $24,353. About 5.9% of families and 7.8% of the population were below the poverty line, including 15.4% of those under age 18 and 2.7% of those age 65 or over.