Shell Ridge, California
census-designated place in Contra Costa County, California
Shell Ridge is a census-designated place 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
According to the United States Census Bureau, the CDP has a total area of 0.430 square miles (1.11 km2), all land. The Shell Ridge Open Space [1] is the largest open space area in Walnut Creek and contains 31 miles of trails.
Demographics
2020 census
As of the 2020 census, Shell Ridge had a population of 1,014. The population density was 2,358.1 inhabitants per square mile (910.5/km2). 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.
The census reported that 100% of the population lived in households.
“Shell Ridge, California” enters the record as census-designated place in Contra Costa County, California. Crown Archives preserves that source wording while asking what Shell, Ridge and California can confirm, complicate or overturn.
Why this record matters
“Shell Ridge, California” is worth following because a concise public description often conceals a longer documentary argument. Here, Shell, Ridge and California provides the most credible route into that argument.
The strongest evidence will usually combine a dated visual record with documents produced by the authority responsible for the place. The source revision retrieved here is dated Sep 6, 2026. The linked authority identifier is Q5803291. The first chronological checks are 2020.
A single description cannot reconcile every naming convention, rebuilding phase or administrative transfer associated with a place. The lead is largely declarative, so disagreement and counter-evidence require a deliberate search beyond the opening account. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.
How to read it
Treat names, boundaries and functions as historically changeable. Maps, plans, inventories and administrative records can clarify what the place meant at different dates.
- Historic place names
- Jurisdictional context
- Routes into maps and plans
Contemporary maps, plans, listed-building records, estate papers and the responsible local or national archive.
Three-step research path
- Establish the record: confirm the title “Shell Ridge, California”, its source revision and the description used here.
- Expand the search: follow Shell Ridge, California primary sources, Shell Ridge, California archive and Shell research across catalogues and specialist indexes.
- Test the account: compare the strongest cited source with the responsible institution’s current record and note any disagreement.
Questions for further research
- Which source most directly establishes the central claim about “Shell Ridge, California”?
- Which earlier names or jurisdictions may reveal additional records?
- What physical evidence or contemporary plan supports the description?
Search terms from this dossier
This entry incorporates text from “Shell Ridge, California” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.