Newport is a census-designated place in York County, South Carolina. Most of Newport is annexed into the city of Rock Hill, while parts are still located in unincorporated York County, but Newport is still considered to be a census-designated place. The census of 2010 showed the population to be 4,136. During the 2000 Census, the population was 4,033.
| align = right
| align-fn = center
2020 census
{| class="wikitable"
|+Newport racial composition
!Race
!Num.
!Perc.
|-
|White (non-Hispanic)
|3,395
|71.56%
|-
|Black or African American (non-Hispanic)
|786
|16.57%
|-
|Native American
|30
|0.63%
|-
|Asian
|74
|1.56%
|-
|Other/Mixed
|226
|4.76%
|-
|Hispanic or Latino
|233
|4.91%
|}
As of the 2020 census, Newport had a population of 4,744. The median age was 42.7 years. 21.6% of residents were under the age of 18 and 17.7% were 65 years of age or older. For every 100 females, there were 91.5 males, and for every 100 females age 18 and over, there were 90.0 males.
84.3% of residents lived in urban areas, while 15.7% lived in rural areas.
There were 1,820 households and 1,231 families residing in the CDP. Of households, 30.2% had children under the age of 18 living in them. Of all households, 62.4% were married-couple households, 11.8% were households with a male householder and no spouse or partner present, and 21.4% were households with a female householder and no spouse or partner present. About 20.5% of all households were made up of individuals, and 9.9% had someone living alone who was 65 years of age or older.