Elk Plain is a census-designated place (CDP) in Pierce County, Washington, United States. The population was 14,534 at the 2020 census.
Geography
According to the United States Census Bureau, the CDP has a total area of , of which are land and are water.<br>2020 Census
! Pop. 2010
!
! % 2000
! % 2010
!
|-
| White alone (NH)
| 12,283
| 10,722
| style='background: #ffffe6; |10,095
| 78.25%
| 75.48%
| style='background: #ffffe6; |69.46%
|-
| Black or African American alone (NH)
| 825
| 628
| style='background: #ffffe6; |590
| 5.26%
| 4.42%
| style='background: #ffffe6; |4.06%
|-
| Native American or Alaska Native alone (NH)
| 184
| 157
| style='background: #ffffe6; |149
| 1.17%
| 1.11%
| style='background: #ffffe6; |1.03%
|-
| Asian alone (NH)
| 621
| 484
| style='background: #ffffe6; |494
| 3.96%
| 3.41%
| style='background: #ffffe6; |3.40%
|-
| Pacific Islander alone (NH)
| 205
| 324
| style='background: #ffffe6; |291
| 1.31%
| 2.28%
| style='background: #ffffe6; |2.00%
|-
| Other race alone (NH)
| 36
| 23
| style='background: #ffffe6; |94
| 0.23%
| 0.16%
| style='background: #ffffe6; |0.65%
|-
| Mixed race or multiracial (NH)
| 800
| 881
| style='background: #ffffe6; |1,317
| 5.10%
| 6.20%
| style='background: #ffffe6; |9.06%
|-
| Hispanic or Latino (any race)
| 743
| 986
| style='background: #ffffe6; |1,504
| 4.73%
| 6.94%
| style='background: #ffffe6; |10.35%
|-
| Total
| 15,697
| 14,205
| style='background: #ffffe6; |14,534
| 100.00%
| 100.00%
| style='background: #ffffe6; |100.00%
|}
2020 census
As of the 2020 census, there were 14,534 people and 3,821 families residing in the CDP. The population density was . There were 5,094 housing units at an average density of .
There were 4,967 households in Elk Plain, of which 35.1% had children under the age of 18 living in them. Of all households, 57.1% were married-couple households, 16.4% were households with a male householder and no spouse or partner present, and 17.7% were households with a female householder and no spouse or partner present. About 16.3% of all households were made up of individuals and 6.3% had someone living alone who was 65 years of age or older. Of all housing units, 2.5% were vacant. The homeowner vacancy rate was 0.8% and the rental vacancy rate was 3.1%.