2020 census
As of the 2020 census, Elko had a population of 20,564. The median age was 32.4 years. 27.6% of residents were under the age of 18 and 10.9% of residents were 65 years of age or older. For every 100 females there were 105.2 males, and for every 100 females age 18 and over there were 105.2 males age 18 and over.
98.3% of residents lived in urban areas, while 1.7% lived in rural areas.
There were 7,915 households in Elko, of which 37.2% had children under the age of 18 living in them. Of all households, 43.6% were married-couple households, 24.3% were households with a male householder and no spouse or partner present, and 23.5% were households with a female householder and no spouse or partner present. About 29.2% of all households were made up of individuals and 9.0% had someone living alone who was 65 years of age or older.
There were 8,685 housing units, of which 8.9% were vacant. The homeowner vacancy rate was 1.8% and the rental vacancy rate was 10.5%.
2000 census
As of the 2000 census, there were 16,708 people, 6,200 households, and 4,216 families residing in the city. The population density was 1,153.3 inhabitants per square mile (445.3/km2). There were 6,948 housing units at an average density of 479.6 per square mile (185.2/km2). The racial makeup of the city was 83.16% White, 0.37% Black, 2.66% Native American, 1.12% Asian, 0.12% Pacific Islander, 9.63% from other races, and 2.94% from two or more races. Hispanic or Latino people of any race were 21.12% of the population.
There were 6,200 households, out of which 39.2% had children under the age of 18 living with them, 53.5% were married couples living together, 9.1% had a female householder with no husband present, and 32.0% were non-families. 24.5% of all households were made up of individuals, and 6.3% had someone living alone who was 65 years of age or older. The average household size was 2.66 and the average family size was 3.24.
In the city, the population was spread out, with 30.3% under the age of 18, 9.8% from 18 to 24, 31.2% from 25 to 44, 21.0% from 45 to 64, and 7.6% who were 65 years of age or older. The median age was 32 years. For every 100 females, there were 104.6 males. For every 100 females age 18 and over, there were 105.3 males.
The median income for a household in the city was $48,608, and the median income for a family was $52,754. Males had a median income of $43,397 versus $27,366 for females. The per capita income for the city was $20,101. About 6.1% of families and 8.2% of the population were below the poverty line, including 8.9% of those under age 18 and 8.4% of those age 65 or over.