Eldridge is a census-designated place (CDP) in Sonoma County, California, United States.

[3] According to the United States Census Bureau, the CDP has a total area of 0.7 square miles (1.8 km2), all of it land.

137 households (27.4%) were made up of individuals, and 33 (6.6%) had someone living alone who was 65 years of age or older.

There were 563 housing units at an average density of 863.5 per square mile (333.4/km2), of which 53.4% were owner-occupied and 46.6% were occupied by renters.

There were 551 housing units at an average density of 863.2 per square mile (333.3/km2).

30.3% of all households were made up of individuals, and 5.8% had someone living alone who was 65 years of age or older.

None of the families and 16.3% of the population were living below the poverty line, including no under eighteens and 11.8% of those over 64.

In the California State Legislature, Eldridge is in the 2nd Senate District, represented by Democrat Mike McGuire, and in the 4th Assembly District, represented by Democrat Cecilia Aguiar-Curry.