Ontario | Hamilton, Ontario | County Durham | Orange County | County Cork | University of Western Ontario | Progressive Conservative Party of Ontario | Kingston, Ontario | St. Louis County, Minnesota | London, Ontario | Ontario Liberal Party | County Galway | County Mayo | county | Windsor, Ontario | Montgomery County | Los Angeles County Museum of Art | education | Lancashire County Cricket Club | Education | National Film Board of Canada | Westchester County, New York | Nassau County, New York | County Antrim | Rockland County, New York | Lake Ontario | County Down | Washington County | Hillsborough County | Derby County F.C. |
Most of the schools in the area were under the Ontario County Board of Education (now Durham District School Board) before 1976 when the area was still part of Pickering.