The Diocese of Ontario is a diocese of the Ecclesiastical Province of Ontario of the Anglican Church of Canada, itself a province of the Anglican Communion. Its See city is Kingston, Ontario, and its cathedral is St. George's, Kingston. The diocese is not coterminous with the Canadian civil province of Ontario, but rather encompasses approximately 17,700 square kilometres of it, comprising the counties of Prince Edward, Hastings, Lennox and Addington, Frontenac, and Leeds and Grenville. Apart from Kingston, other major centres included in the diocese are Belleville, Brockville, and Trenton. The diocese ministers to approximately 8,500 Anglicans in 45 parishes.