|— CDP —|
|• Total||76.2 sq mi (197.4 km2)|
|• Land||69.6 sq mi (180.3 km2)|
|• Water||6.6 sq mi (17.1 km2)|
|Elevation||128 ft (39 m)|
|• Density||62.2/sq mi (24.0/km2)|
|Time zone||Alaska (AKST) (UTC-9)|
|• Summer (DST)||AKDT (UTC-8)|
|GNIS feature ID||1416651|
Nikiski is located at .(60.707891, -151.262646)
According to the United States Census Bureau, the CDP has a total area of 76.2 square miles (197 km2), of which, 69.6 square miles (180 km2) of it is land and 6.6 square miles (17 km2) of it (8.66%) is water.
The only road access is via the Kenai Spur Highway.
As of the census of 2000, there were 4,327 people, 1,514 households, and 1,130 families residing in the CDP. The population density was 62.2 people per square mile (24.0/km²). There were 1,766 housing units at an average density of 25.4/sq mi (9.8/km²). The racial makeup of the CDP was 87.15% White, 0.12% Black or African American, 7.56% Native American, 0.72% Asian, 0.51% Pacific Islander, 0.83% from other races, and 3.12% from two or more races. 1.32% of the population were Hispanic or Latino of any race.
There were 1,514 households out of which 41.7% had children under the age of 18 living with them, 60.9% were married couples living together, 7.9% had a female householder with no husband present, and 25.3% were non-families. 20.8% of all households were made up of individuals and 3.8% had someone living alone who was 65 years of age or older. The average household size was 2.86 and the average family size was 3.31.
In the CDP the population was spread out with 33.5% under the age of 18, 6.3% from 18 to 24, 29.8% from 25 to 44, 24.5% from 45 to 64, and 5.9% who were 65 years of age or older. The median age was 34 years. For every 100 females there were 109.0 males. For every 100 females age 18 and over, there were 111.3 males.
The median income for a household in the CDP was $51,176, and the median income for a family was $55,969. Males had a median income of $50,673 versus $26,779 for females. The per capita income for the CDP was $20,128. About 9.3% of families and 11.4% of the population were below the poverty line, including 13.0% of those under age 18 and 7.5% of those age 65 or over.
See also 
- "US Gazetteer files: 2010, 2000, and 1990". United States Census Bureau. 2011-02-12. Retrieved 2011-04-23.
- "American FactFinder". United States Census Bureau. Retrieved 2008-01-31.