|County of Middlesex|
|Coordinates: 43°00′N81°30′W / 43.000°N 81.500°W Coordinates: 43°00′N81°30′W / 43.000°N 81.500°W|
|Named for||Middlesex, England|
|• Land||2,821.00 km2 (1,089.19 sq mi)|
|• Density||25.4/km2 (66/sq mi)|
|Time zone||UTC-5 (EST)|
|• Summer (DST)||UTC-4 (EDT)|
Middlesex County (2016 population 71,551)  is a primarily rural county in Southwestern Ontario, Canada covering 3,317.27 square kilometres. Landlocked, the county is bordered by Huron and Perth counties on the north, Oxford County on the east, Elgin County on the south, and Chatham-Kent and Lambton County on the west.
The county seat is the city of London, although the city is politically independent from the county. The Middlesex census division, which consists of the county together with the City of London and three First Nations reserves, had a population of 455,526 in 2016.  Part of the county is also included in the London census metropolitan area.
Middlesex County is composed of eight incorporated municipalities (in order of population):
First Nations reserves located within the Middlesex census division but separate from Middlesex County:
The area was originally organized as Suffolk County, created in July 1792 by Governor Simcoe by his first proclamation issued at Kingston, which also defined it as a constituency for the purposes of returning a member to the new Legislative Assembly of Upper Canada, and was described as having the following territory: 
... bounded on the east by the county of Norfolk, on the south by lake Erie, until it meets the carrying-place from point au Pins unto the Thames,  on the west by the said carrying-place, thence up the said river Thames until it meets the northwesternmost boundary of the county of Norfolk.
Simcoe toured the southwestern portion of the province's territory in early 1793 and concluded that the lower forks of the Thames would be best suited as the future site of the provincial capital. The names London in Middlesex were considered more appropriate for this.[ citation needed ] Suffolk County was reorganized as Middlesex County, as part of the London District, in 1798 by the Legislative Assembly of Upper Canada,  consisting of the townships of London, Westminster, Dorchester, Yarmouth, Southwold, Dunwich, Aldborough and Delaware.
Middlesex County was expanded several times thereafter, starting in 1821 with the addition of the townships of Moza, Ecfrid (sic), Carradoc (sic) and Lobo.  Adelaide Township came from the Huron Tract in 1835,  and Williams Township was withdrawn from Huron County and annexed to Middlesex in 1845.  In 1837, Bayham and Malahide Townships were transferred to Middlesex from Norfolk County.  Metcalfe Township was formed from the north part of Ekfrid and the south part of Adelaide in 1845. 
Upon the abolition of the London District in January 1850, Middlesex County was constituted for municipal purposes.  The County was reorganized as the United Counties of Middlesex and Elgin in 1851, with its townships divided thus:
|Elgin County||Middlesex County|
Elgin County was separated from Middlesex in September 1853. 
The townships of Biddulph and McGillivray were withdrawn from Huron County and annexed to Middlesex in 1862. 
The historic townships of the County (including those originally part of Huron County marked in red) are shown below:
London, when it became a city in 1855, separated from Middlesex County,  and it expanded later in stages:
Members of the County Council are the mayors (or reeves) of the municipalities of Adelaide Metcalfe, Lucan Biddulph, Middlesex Centre, North Middlesex, Southwest Middlesex, Strathroy-Caradoc and Thames Centre as well as the Village of Newbury. Centres with a population exceeding 5,000 also get an additional seat for their deputy mayors. The head of council is one of its members who is elected as reeve for a one year term by the councillors. 
Middlesex County has 38,231 people over the age of 15, with 45% of them working in the same municipality as the one they live in.  That implies that more than 50% of them commute to other municipalities.
|All data from the Census of Canada|
Wellington County is a county located in Southwestern Ontario, Canada and is part of the Greater Golden Horseshoe. The County, made up of two towns and five townships, is predominantly rural in nature. However many of the residents in the southern part of the County commute to urban areas such as Guelph, Kitchener, Waterloo, Brampton, Mississauga, Toronto and Hamilton for employment. The northern part of the county is made up of mainly rural farming communities, except for a few larger towns such as Mount Forest and Arthur. According to the 2016 Census, the population of the County was 90,932.
Renfrew County is a county in the Canadian province of Ontario. It stands on the west bank of the Ottawa River. There are 17 municipalities in the county.
Simcoe County is located in the central portion of Southern Ontario, Canada. The county is just north of the Greater Toronto Area, stretching from the shores of Lake Simcoe in the east to Georgian Bay in the west. Simcoe County forms part of the Greater Golden Horseshoe area, a densely populated and industrialized region, centred on the Greater Toronto Area.
Bruce County is a county in Southwestern Ontario, Canada comprising eight lower-tier municipalities and with a 2016 population of 66,491. It is named for James Bruce, 8th Earl of Elgin and 12th Earl of Kincardine, sixth Governor General of the Province of Canada. The Bruce name is also linked to the Bruce Trail and the Bruce Peninsula. It has three distinct areas. The Peninsula is part of the Niagara Escarpment and is known for its views, rock formations, cliffs, and hiking trails. The Lakeshore includes nearly 100 km of fresh water and soft sandy beaches. Finally, the Interior Region has a strong history in farming.
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Perth County is a county in the Canadian province of Ontario in Southwestern Ontario, 100 kilometres (62 mi) west of Toronto. Its population centres are Listowel, Mitchell and Milverton. The City of Stratford and the Town of St. Marys are within the Perth census division, but are separate from Perth County. Perth County's 2016 population was 38,066.
Middlesex Centre is a township in Middlesex County, in southwestern Ontario, Canada, north and west of London. The Corporation of the Township of Middlesex Centre formed on January 1, 1998, with the amalgamation of the former Townships of Delaware, Lobo, and London. It is part of the London census metropolitan area.
Lennox County is a historic county in the Canadian province of Ontario which now forms part of Lennox and Addington County. It was named after Charles Lennox, 3rd Duke of Richmond.
Peel County is a historic county in the Canadian province of Ontario. Named for Sir Robert Peel, Prime Minister of the United Kingdom, the county was organized in 1851. Settlers, however, were in Toronto Township as early as 1807. The Credit River was reserved for the Mississaugas, however they sold their land and moved to the Bruce Peninsula.
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.
Middlesex North was a federal electoral district in Ontario, Canada, that was represented in the House of Commons of Canada from 1867 to 1917. It was created by the British North America Act of 1867 which divided the County of Middlesex into three ridings: the Middlesex North, Middlesex West and Middlesex East.
Strathroy-Caradoc is a municipality located in Southwestern Ontario, Canada. It is 35 kilometres (22 mi) west of London.
The London District was a historic district in Upper Canada. It was formed in 1798 from parts of the Home and Western Districts, and lasted until its abolition in 1850.
North Middlesex is a municipality in Middlesex County, Ontario, Canada.
Lucan Biddulph is an incorporated township in southwestern Ontario, Canada. It was formed on January 1, 1999, by amalgamating the Village of Lucan with Biddulph Township. The township had a population of 4,700 people in the Canada 2016 Census, up 8.3% from 4,388 people in 2011, and covers an area of 169.14 km2 of land within Middlesex County.
Lambton—Kent—Middlesex is a provincial electoral district in southwestern Ontario, Canada. It elects one member to the Legislative Assembly of Ontario.
Middlesex-London Paramedic Service is the statutory Emergency medical services provider for Middlesex County, and London, Ontario. The service provides EMS to the City of London, the Townships of Adelaide Metcalfe, Lucan Biddulph, Middlesex Centre, North Middlesex, Southwest Middlesex, Strathroy-Caradoc, Thames Centre, Newbury. The Middlesex London Emergency Medical Services Authority delivers ambulance service to Middlesex and London in accordance with service and patient care standards set by the County of Middlesex and Ministry of Health and Long Term Care. Medical oversight for controlled medical acts is provided under the direction of the Southwestern Ontario Regional Base Hospital Program.
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