Kingco Athletic Conference

The KingCo Athletic Conference is a high school athletics conference in King County, Washington, part of the Washington Interscholastic Activities Association (WIAA). Its 17 members are in SeaKing District II, which includes Seattle and east King County, and includes schools in the three highest classification levels, 4A, 3A and 2A.

4A members
12 schools, competing in two divisions ^ switched divisions for the 2012–13 school year

^^ switched divisions for the 2024-25 school year

3A Members
^^ switched divisions for the 2024-25 school year