King County is located on Puget Sound in Washington State.  It is bordered on the north by Snohomish County, the northeast by Chelan County, the southeast by Kittitas County, the south by Pierce County and across the Puget Sound on the west by Kitsap County.  As of the 2010 U.S. Census, King County has a total land area of 2,115.57 square miles and a population of 1,931,249.  Seattle is its largest city with a population of 608,660. Also of interest:

• The intersecting watershed sub-basins(9):  Puyallup, Naches, Upper Yakima, Wenatchee, Puget Sound, Lake Washington, Duwamish, Skykomish and Snoqualmie.
• Major lakes:  Lake Washington, Lake Sammamish and Chester Morse Lake.
• Major rivers:  Green River, White River, Snoqualmie River, Cedar River, Taylor River, Tolt River, Sammamish River and Skykomish River.
• Mount Daniel (7,960 feet) is part of the Cascade Range and the highest point in King County.

U.S. Census Bureau QuickFacts for King County, WA

King County Biodiversity Report

Office of Financial Management (OFM) county data for King County, WA