Nikiski is a census-designated place (CDP) in Kenai Peninsula Borough, Alaska, United States. The population was 4,456 at the 2020 census, down from 4,493 in 2010.
Geography
Nikiski is located at (60.707891, -151.262646) on the west side of the Kenai Peninsula. It lies along the shore of Cook Inlet between Salamatof to the south and the Swanson River to the northeast. It is bordered across the Swanson River by the Point Possession CDP.
According to the United States Census Bureau, the Nikiski CDP has a total area of , of which are land and , or 8.57%, are water.
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thumb|Piers extending into Cook Inlet from in-use and vacant industrial facilities
Nikiski first appeared on the 1880 U.S. Census as the unincorporated Tinneh villages of "Kultuk" (AKA Nikishka No. 3) and "Titukilsk and Nikishka". Kultuk had a population of 17, and Titukilsk and Nikishka had a population of 57, all of whom were Tinneh Natives. There apparently were no census reports from 1880 until 1980, when the area was organized as "Nikishka" and made a census-designated place (CDP). The name was altered to "Nikiski" in 1990 and has reported as such on each successive census.
2020 census
As of the 2020 census, Nikiski had a population of 4,456. The median age was 42.7 years. 24.5% of residents were under the age of 18 and 18.3% of residents were 65 years of age or older. For every 100 females there were 111.5 males, and for every 100 females age 18 and over there were 108.1 males age 18 and over.
0.0% of residents lived in urban areas, while 100.0% lived in rural areas.
There were 1,724 households in Nikiski, of which 28.2% had children under the age of 18 living in them. Of all households, 54.2% were married-couple households, 21.0% were households with a male householder and no spouse or partner present, and 16.8% were households with a female householder and no spouse or partner present. About 25.4% of all households were made up of individuals and 11.0% had someone living alone who was 65 years of age or older. of 2000, there were 4,327 people, 1,514 households, and 1,130 families residing in the CDP. The population density was . There were 1,766 housing units at an average density of . The racial makeup of the CDP was 87.2% White, 0.1% Black or African American, 7.6% Native American, 0.7% Asian, 0.5% Pacific Islander, 0.8% from other races, and 3.1% from two or more races. 1.3% 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.
History
thumb|A motel from the area's boom days, now abandoned
Nikiski was once home to an Agrium fertilizer plant, which was once the Kenai Peninsula Borough's largest employer. The facility closed in 2008 due to natural gas shortages, but the company continues to explore reopening it.