King County may not be at the geographic center of Washington, but it is the economic, population, cultural and educational center. Its county seat is Seattle
, easily the largest city in Washington. Its eastern suburbs across Lake Washington
, such as Bellevue
, and Kirkland
, are prospering and growing rapidly. The formerly unincorporated areas around the Sea-Tac airport and south have become the cities of Sea-Tac and Federal Way
, instantly becoming some of the larger cities in the state. And eastward, the county extends into the fastness of the Cascades.