According to the United States Census Bureau, the CDP has a total area of 93.7 square miles (242.7 km²), of which, 82.2 square miles (213.0 km²) of it is land and 11.4 square miles (29.6 km²) of it (12.21%) is water.
There were 626 households out of which 34.2% had children under the age of 18 living with them, 62.3% were married couples living together, 8.3% had a female householder with no husband present, and 26.8% were non-families. 22.4% of all households were made up of individuals and 9.4% had someone living alone who was 65 years of age or older. The average household size was 2.71 and the average family size was 3.21.
In the CDP the population was spread out with 26.3% under the age of 18, 9.9% from 18 to 24, 26.4% from 25 to 44, 27.0% from 45 to 64, and 10.5% who were 65 years of age or older. The median age was 37 years. For every 100 females there were 98.0 males. For every 100 females age 18 and over, there were 96.4 males.
The median income for a household in the CDP was $37,366, and the median income for a family was $51,780. Males had a median income of $36,719 versus $25,192 for females. The per capita income for the CDP was $16,332. About 3.9% of families and 9.2% of the population were below the poverty line, including 11.5% of those under age 18 and 4.4% of those age 65 or over.
Cameron Parish Public Library operates the Hackberry Branch at 983 Main Street in the Hackberry CDP.