The East Riding of the county of Lambton was initially defined to consist of the townships of Enniskillen, Brooke, Warwick and Bosanquet, the town of Petrolia, and the villages of Oil Springs, Alvinston, Watford, Arkona and Thedford.
In 1903, it was expanded to include the township of Euphemia and the town of Forest. In 1914, it was expanded to include the townships of Zone and Camden in the county of Kent.
In 1924, it was defined as consisting of the townships of Bosanquet, Warwick, Inniskillen, Brooke, Dawn and Euphemia in the County of Lambton, and the townships of Zone and Camden in the County of Kent.
The electoral district was abolished in 1933 when it was redistributed between Lambton West and Lambton—Kent ridings.
Bothwell was a federal electoral district in the Canadian province of Ontario, which was represented in the House of Commons of Canada from 1867 to 1904. It is sometimes also considered one of Ontario's historic counties, as it was listed in some post-Confederation census records as a county of residence.
Lambton—Kent—Middlesex is a federal electoral district in Ontario, Canada, that has been represented in the House of Commons of Canada since 1997.
Sarnia—Lambton is a federal electoral district in Ontario, Canada, that has been represented in the House of Commons of Canada since 1968. It is located in the area of the city of Sarnia, in the southwest corner of the province of Ontario.
Mégantic was a federal electoral district in the province of Quebec, Canada, that was represented in the House of Commons of Canada from 1867 to 1935, and from 1949 to 1968.
Grey North was a federal electoral district represented in the House of Commons of Canada from 1867 to 1968. It was located in the province of Ontario. It was created by the British North America Act of 1867, which divided the County of Grey into two ridings: Grey South and Grey North. The North Riding consisted of the Townships of Collingwood, Euphrasia, Holland, Saint-Vincent, Sydenham, Sullivan, Derby, and Keppel, Sarawak and Brooke, and the Town of Owen Sound.
Huron South was a federal electoral district in Ontario, Canada, that was represented in the House of Commons of Canada from 1867 to 1935. It was created by the British North America Act of 1867 which divided the County of Huron into two ridings: Huron North and Huron South.
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.
Lambton was a federal electoral district represented in the House of Commons of Canada from 1867 to 1882. It was located in the province of Ontario. It was created by the British North America Act of 1867.
Middlesex East was a former federal electoral district in Ontario, Canada, represented in the House of Commons of Canada from 1867 to 1968. It was created by the British North America Act of 1867, which divided the County of Middlesex into three ridings: Middlesex North, Middlesex West and Middlesex East.
Middlesex West was a federal electoral district represented in the House of Commons of Canada from 1867 to 1968. It was located in the province of Ontario. It was created by the British North America Act of 1867 which divided the County of Middlesex into three ridings: Middlesex North, Middlesex West and Middlesex East.
Essex South was a federal and provincial electoral district represented in the House of Commons of Canada from 1882 to 1968. It was located in the province of Ontario. This riding was created in 1882 from parts of Essex riding.
Huron East was a federal electoral district represented in the House of Commons of Canada from 1882 to 1917. It was located in the province of Ontario. This riding was created from parts of Huron Centre, Huron North and Huron South ridings.
Lambton West was a federal electoral district represented in the House of Commons of Canada from 1883 to 1968. It was located in the province of Ontario. This riding was created from parts of Lambton riding.
Kent East was a federal electoral district represented in the House of Commons of Canada from 1904 to 1917. It was located in the province of Ontario. This riding was created in 1903 when Kent riding was divided into two ridings: Kent East and Kent West. It incorporated parts of Bothwell and Elgin West ridings.
Lambton—Kent was a federal electoral district in Ontario, Canada, that was represented in the House of Commons of Canada from 1935 to 1979. This riding was created in 1933 from parts of Kent, Lambton East and Lambton West ridings.
Middlesex 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 Lambton West, Lambton—Kent, Middlesex West and Middlesex East ridings.
Lambton—Middlesex is a federal electoral district represented in the House of Commons of Canada from 1979 to 1997. It was located in the province of Ontario. This riding was created in 1976 from parts of Huron—Middlesex, Lambton—Kent, Middlesex—London—Lambton and Sarnia—Lambton ridings.
Essex—Kent was a federal electoral district in Ontario that was represented in the House of Commons of Canada from 1979 to 1997.
Perth—Middlesex was an electoral district in Ontario, Canada, that was represented in the House of Commons of Canada from 1997 to 2003 and in the Legislative Assembly of Ontario from 1999 to 2007.
Lambton—Kent—Middlesex is a provincial electoral district in southwestern Ontario, Canada. It elects one member to the Legislative Assembly of Ontario.
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Ontario electoral district 
