Deer Park is a census-designated place (CDP)[2] in Napa County, California, United States.

Deer Creek is where Elmshaven, a large Victorian home lived in by Ellen White in the early twentieth century, is located.

[3] The Glass Fire caused significant damage throughout Deer Park in late September 2020, destroying numerous houses as well as much of the Foothills Adventist Elementary School.

[5] According to the United States Census Bureau, the CDP has a total area of 5.6 square miles (15 km2), 99.93% of it land and 0.07% of it water.

The 2010 United States Census[7] reported that Deer Park had a population of 1,267.

174 households (30.9%) were made up of individuals, and 67 (11.9%) had someone living alone who was 65 years of age or older.

There were 685 housing units at an average density of 122.7 per square mile (47.4/km2), of which 318 (56.4%) were owner-occupied, and 246 (43.6%) were occupied by renters.

24.7% of all households were made up of individuals, and 6.4% had someone living alone who was 65 years of age or older.

In the California State Legislature, Deer Park is in the 3rd Senate District, represented by Democrat Christopher Cabaldon, and in the 4th Assembly District, represented by Democrat Cecilia Aguiar-Curry.