Sound Transit Express (ST Express) is the bus network of Puget Sound transit agency Sound Transit. The agency, based in Seattle, Washington, provides inter-county bus service throughout 53 cities in three counties (King, Pierce, and Snohomish). While Sound Transit oversees, plans, and funds the service, operation and maintenance of the buses is contracted out to King County Metro, Pierce Transit, and Community Transit (who subcontracts with First Transit).