Rheem, California
unincorporated community in California
Rheem, also known as Rheem Valley and Rheem Center, is an unincorporated community in Contra Costa County, California, United States. It is located 7.5 miles (12 km) north-northwest of Danville, at an elevation of 587 feet (179 m). It was incorporated into the town of Moraga when that town was incorporated in 1974.
The place was named after its developer, Donald Laird Rheem, one of the founders of Rheem Manufacturing Company and the son of William Rheem, President of Standard Oil Company.
“Rheem, California” enters the record as unincorporated community in California. Crown Archives preserves that source wording while asking what Rheem, California and unincorporated can confirm, complicate or overturn.
Why this record matters
“Rheem, California” is worth following because a concise public description often conceals a longer documentary argument. Here, Rheem, California and unincorporated provides the most credible route into that argument.
Named sources, stable identifiers and responsible institutions provide the strongest route from overview to verifiable evidence. The source revision retrieved here is dated Sep 6, 2026. The linked authority identifier is Q7320325. Authority coordinates are 37.861, -122.127. 1 of 1 selected statements include explicit references; 0 carry qualifiers and 0 use preferred rank. The first chronological checks are 1974.
A concise general-reference account can conceal disagreements about scope, terminology or the weight assigned to individual sources. 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
Use the entry as an orientation point, then follow its citations and revision history. Names, dates and institutional relationships should be checked against the original record.
- Subject orientation
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The closest primary source, responsible institution and strongest cited specialist reference.
Three-step research path
- Establish the record: confirm the title “Rheem, California”, its source revision and the description used here.
- Expand the search: follow Rheem, California primary sources, Rheem, California archive and Rheem 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
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This entry incorporates text from “Rheem, 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.