Shell Ridge is a census-designated place in Contra Costa County, California, United States. Shell Ridge sits at an elevation of . The 2020 United States census reported Shell Ridge's population was 1,014.
According to the United States Census Bureau, the CDP has a total area of , all of it land. The Shell Ridge Open Spacehttps://www.walnut-creek.org/Home/Components/FacilityDirectory/FacilityDirectory/10/664 is the largest open space area in Walnut Creek, CA, and contains 31 miles of trails.
Shell Ridge first appeared as a census designated place in the 2010 U.S. census.
The 2020 United States census reported that Shell Ridge had a population of 1,014. The population density was . The racial makeup of Shell Ridge was 74.6% White, 0.6% African American, 0.0% Native American, 12.7% Asian, 0.0% Pacific Islander, 1.8% from other races, and 10.4% from two or more races. Hispanic or Latino of any race were 7.2% of the population.
The census reported that 100% of the population lived in households.
There were 367 households, out of which 34.1% included children under the age of 18, 71.7% were married-couple households, 4.9% were cohabiting couple households, 16.1% had a female householder with no partner present, and 7.4% had a male householder with no partner present. 15.3% of households were one person, and 9.5% were one person aged 65 or older. The average household size was 2.76. There were 292 families (79.6% of all households).
The age distribution was 23.6% under the age of 18, 4.4% aged 18 to 24, 16.9% aged 25 to 44, 31.2% aged 45 to 64, and 24.0% who were 65years of age or older. The median age was 49.4years. For every 100 females, there were 100.0 males.
There were 377 housing units at an average density of , of which 367 (97.3%) were occupied. Of these, 90.7% were owner-occupied, and 9.3% were occupied by renters.
A portion of Shell Ridge is in the Walnut Creek Elementary School District and the Acalanes Union High School District. Other parts are in the K-12 Mount Diablo Unified School District.