On March 23, 1892 Birch Post Office opens. Arnold Keller is appointed and serves as the only postmaster. On July 15, 1897, the post office closes. Birch is located 30 miles southeast of Seattle 1.5 miles northeast of Enumclaw along the Northern Pacific Railroad line.
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.