The Seattle Mariners have completed 45 seasons of professional baseball in the West division of Major League Baseball (MLB)'s American League (AL) since they began play in 1977. From April 6, 1977 until June 27, 1999, the Mariners played in Seattle's Kingdome. Since July 15, 1999, the Mariners have played at T-Mobile Park (formerly Safeco Field). Their name reflects their home city's coastal and marine culture.