Kings Bay Base is located at (30.798022, -81.564966).
According to the United States Census Bureau, the CDP has a total area of 2.0 square miles (5.3 km²), all of it land.
There were 429 households out of which 75.5% had children under the age of 18 living with them, 95.6% were married couples living together, 2.1% had a female householder with no husband present, and 0.7% were non-families. 0.7% of all households were made up of individuals. The average household size was 3.47 and the average family size was 3.48.
In the CDP the population was spread out with 24.7% under the age of 18, 46.2% from 18 to 24, 28.1% from 25 to 44, and 1.0% from 45 to 64. The median age was 22 years. For every 100 females there were 230.2 males. For every 100 females age 18 and over, there were 320.9 males.
The median income for a household in the CDP was $33,438, and the median income for a family was $33,438. Males had a median income of $19,122 versus $17,721 for females. The per capita income for the CDP was $12,609. About 6.1% of families and 7.5% of the population were below the poverty line, including 10.0% of those under age 18.