All land in the Western United States, including King County, Washington, is surveyed into a rectangular grid system in accordance with the U. S. Land Ordinance of 1785. The grid system, used to identify the legal boundaries of real estate, divides land into sections and townships. A section is one square mile (640 acres) and a township is 36 sections (36 square miles). Birch is located
at the southwest quarter Section 7 Township 20 N Range 7 E.
Birch Post Office opens on March 23, 1892.
- By Greg Lange
- Posted 12/13/1998
- HistoryLink.org Essay 535
Sources: Guy Reed Ramsey, "Postmarked Washington, 1850-1960," Microfilm (Olympia: Washington State Library, February, 1966), 640.
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