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Shell Ridge is a census-designated place[2] in Contra Costa County, California, United States. Shell Ridge sits at an elevation of 295 feet (90 m). The 2020 United States census reported Shell Ridge’s population was 1,014.

Geography

Shell Ridge Open Space

According to the United States Census Bureau, the CDP has a total area of 0.430 square miles (1.11 km2), all of it land. The Shell Ridge Open Space[1] is the largest open space area in Walnut Creek, CA, and contains 31 miles of trails.

Demographics

Historical population
CensusPop.Note%±
2010959—
20201,0145.7%
U.S. Decennial Census[3]
2010[4]

2020 census

As of the 2020 census, Shell Ridge had a population of 1,014.[5][6] The population density was 2,358.1 inhabitants per square mile (910.5/km2).[7] The median age was 49.4 years; 23.6% of residents were under the age of 18, 4.4% were aged 18 to 24, 16.9% were aged 25 to 44, 31.2% were aged 45 to 64, and 24.0% were 65 years of age or older. For every 100 females, there were 100.0 males, and for every 100 females age 18 and over, there were 96.2 males age 18 and over.[5]

The census reported that 100% of the population lived in households. There were 367 households, of which 34.1% had children under the age of 18 living in them. Of all households, 71.7% were married-couple households, 4.9% were cohabiting couple households, 7.4% were households with a male householder and no spouse or partner present, and 16.1% were households with a female householder and no spouse or partner present. About 15.2% of all households were made up of individuals, and 9.6% had someone living alone who was 65 years of age or older. The average household size was 2.76. There were 292 families (79.6% of all households).[5][8]

There were 377 housing units at an average density of 876.7 units per square mile (338.5 units/km2). Of all housing units, 2.7% were vacant; the homeowner vacancy rate was 0.3% and the rental vacancy rate was 8.1%. Of the 367 occupied units, 90.7% were owner-occupied and 9.3% were occupied by renters.[5][6][9][7]

100.0% of residents lived in urban areas, while 0.0% lived in rural areas.[9]

Racial composition as of the 2020 census[6]
Race Number Percent
White 756 74.6%
Black or African American 6 0.6%
American Indian and Alaska Native 0 0.0%
Asian 129 12.7%
Native Hawaiian and Other Pacific Islander 0 0.0%
Some other race 18 1.8%
Two or more races 105 10.4%
Hispanic or Latino (of any race) 73 7.2%

2010 census

Shell Ridge first appeared as a census designated place in the 2010 U.S. census.[4]

Education

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.[10]

References

  1. ^ “2020 U.S. Gazetteer Files”. United States Census Bureau. Retrieved July 3, 2025.
  2. ^ a b c “Shell Ridge Census Designated Place”. Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
  3. ^ “Decennial Census by Decade”. United States Census Bureau.
  4. ^ a b “2010 Census of Population – Population and Housing Unit Counts – California” (PDF). United States Census Bureau.
  5. ^ a b c d “2020 Decennial Census Demographic Profile (DP1)”. United States Census Bureau. 2021. Retrieved April 30, 2026.
  6. ^ a b c “2020 Decennial Census Redistricting Data (Public Law 94-171)”. United States Census Bureau. 2021. Retrieved April 30, 2026.
  7. ^ a b “Shell Ridge CDP, California; DP1: Profile of General Population and Housing Characteristics – 2020 Census of Population and Housing”. US Census Bureau. Retrieved March 28, 2025.
  8. ^ “Shell Ridge CDP, California; P16: Household Type – 2020 Census of Population and Housing”. US Census Bureau. Retrieved March 28, 2025.
  9. ^ a b “2020 Decennial Census Demographic and Housing Characteristics (DHC)”. United States Census Bureau. 2023. Retrieved April 30, 2026.
  10. ^ “2020 CENSUS – SCHOOL DISTRICT REFERENCE MAP: Contra Costa County, CA” (PDF). U.S. Census Bureau. Retrieved December 25, 2022.