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On August 12, 1891, the Black River Post Office opens. Henry A. MacMillan is the first postmaster. The mail is distributed from the railroad depot.

On September 15, 1909, the post office closed. Black River was located 10 miles south of Seattle about two miles west of Renton along the Northern Pacific Railroad line on the east bank of Duwamish River.

Sources: Guy Reed Ramsey, "Postmarked Washington, 1850-1960," Microfilm (Olympia: Washington State Library, February, 1966), 634-635.

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