About Rio Dell, CARio Dell is located in California. Rio Dell, California has a population of 3,420. Rio Dell is more family-centric than the surrounding county with 27% households with children. The county percentage for households with children is 23%. The median household income in Rio Dell, California is $44,372. The median household income for the surrounding county is $44,970 compared to the national median of $57,525. The median age of people living in Rio Dell is 39.5 years. Rio Dell WeatherThe average high temperature in July is 69.8 degrees, with an average low temperature in January of 40 degrees. The annual precipitation is 48.47. Rio Dell MapRio Dell real estate officesReal estate near Rio DellNearby CitiesNearby Cities Homes for Sale |