The town was built as a company town for the Black Diamond Coal Company.
Black Diamond beginnings: Black Diamond Post Office opens on July 22, 1885.
- By Greg Lange
- Posted 12/07/1998
- HistoryLink.org Essay 458
Sources: Guy Reed Ramsey, "Postmarked Washington, 1850-1960," Microfilm (Olympia: Washington State Library, February, 1966).
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