This riding was first created in 1914 from Northumberland East and Northumberland West ridings. It initially consisted of the county of Northumberland, excluding the township of Monaghan South. In 1947, South Monaghan was added to the riding, so that it consisted of the county of Northumberland. It was abolished in 1966 when it was redistributed between Northumberland—Durham and Prince Edward—Hastings ridings.
In 1976, Northumberland riding was recreated from parts of those two ridings. The new riding consisted of the County of Northumberland (including the Village of Hastings), but excluding the Township of Hope, the Town of Cobourg, and the part of the Township of Hamilton lying west of the Town of Cobourg and south of the Macdonald Cartier Freeway), and the Townships of Rawdon and Sidney (but excluding the city of Belleville) in the County of Hastings. In 1987, it was redefined to consist of the County of Northumberland and the City of Trenton.
Prince Edward—Hastings was a federal electoral district in Ontario, Canada, that existed in the House of Commons of Canada from 1968 to 2015. Its population in 2006 was 113,227. It was redistributed between Bay of Quinte electoral district and Hastings—Lennox and Addington electoral district as a result of the Canadian federal electoral redistribution, 2012.
Haliburton—Kawartha Lakes—Brock is a federal electoral district in central Ontario, Canada, that has been represented in the House of Commons of Canada since 1968.
Northumberland—Quinte West was a federal electoral district in Ontario, Canada, that was represented in the House of Commons of Canada from 2004 to 2013. Its population in 2001 was 118,906. Following the Canadian federal electoral redistribution, 2012, the electoral district was dissolved into the ridings of Northumberland—Peterborough South and Bay of Quinte.
Peterborough—Kawartha is a federal electoral district in Ontario, Canada, that has been represented in the House of Commons of Canada since 1953. Prior to the 2015 election, the riding was known as Peterborough.
York—Simcoe is a federal electoral district in Ontario, Canada, that has been represented in the House of Commons of Canada from 1968 to 1979, from 1988 to 1997 and since 2004.
Durham is a federal electoral district in Ontario, Canada, that has been represented in the House of Commons of Canada from 1904 to 1968 and since 1988.
Essex is a federal electoral district in Ontario, Canada, represented in the House of Commons of Canada from 1867 to 1882 and since 1968.
Hastings West was a federal electoral district in the province of Ontario, Canada, that was represented in the House of Commons of Canada from 1867 to 1925. It was created by the British North America Act of 1867 which divided the County of Hastings, divided into three ridings: Hastings West, Hastings East and Hastings North.
Kent was a federal electoral district (riding) represented in the House of Commons of Canada from 1867 to 1904, 1917 to 1968, and 1979 to 1997. It was located in the province of Ontario and was created by the British North America Act of 1867.
Northumberland West was a federal electoral district represented in the House of Commons of Canada from 1867 to 1917. It was located in the province of Ontario. It was created by the British North America Act of 1867.
Oxford South was a federal electoral district represented in the House of Commons of Canada from 1867 to 1935. It was located in the province of Ontario. It was created by the British North America Act of 1867.
Peterborough West was a federal electoral district represented in the House of Commons of Canada from 1867 to 1953. It was located in the province of Ontario. It was created by the British North America Act of 1867 which divided the County of Peterborough was into two ridings. The West Riding consisted of the Townships of South Monaghan, North Monaghan, Smith, and Ennismore, and the Town of Peterborough.
Simcoe South was a federal electoral district represented in the House of Commons of Canada from 1867 to 1925, and from 1979 to 1988. It was located north of Toronto in the province of Ontario. It was initially created by the British North America Act of 1867 when the County of Simcoe was divided into two ridings, to be called the South and North Ridings in the Legislative Assembly of the Province of Canada.
Ontario was a federal electoral district represented in the House of Commons of Canada from 1925 to 1997. It was located in the province of Ontario. This riding was created in 1924 from Ontario South riding.
Perth was a federal electoral district in Ontario, Canada, that was represented in the House of Commons of Canada from 1935 to 1988. This riding was created in 1933 from Perth North and parts of Perth South ridings.
Hastings—Frontenac was a federal electoral district in Ontario, Canada, that was represented in the House of Commons of Canada from 1953 to 1968, and from 1979 to 1980.
Northumberland—Durham was a federal electoral district represented in the House of Commons of Canada from 1968 to 1979. It was located in the province of Ontario. This riding was created in 1966 from parts of Durham and Northumberland and a small part of Hastings—Frontenac ridings.
Durham—Northumberland is a former federal electoral district represented in the House of Commons of Canada from 1979 to 1988. It was located in the province of Ontario. This riding was created in 1976 from parts of Northumberland—Durham and Ontario ridings.
Hastings—Frontenac—Lennox and Addington was a federal and provincial electoral district in Ontario, Canada, that was represented in the House of Commons of Canada from 1984 to 2003, and in the Legislative Assembly of Ontario from 1999 to 2007.
Niagara Centre is a federal electoral district in the Niagara Region of Ontario that has been represented in the House of Commons of Canada from 1867 to 1988 and since 1997.
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Ontario electoral district 
