King County, Washington- Maple Valley — Thumbnail History (historylink.org)
Maple Valley, a King County community nestled 10 miles southeast of Renton within the sheer-cliffed Cedar River valley, grew from its outskirts inward toward its center. Originally a hodgepodge of homesteader cabins, its growth can be attributed to the lumber industry, coal mining, railroads, watersheds, and highway development.