Sister cities of Peterborough, Ontario

Peterborough /ˈpiːtərbɔroʊ/ PEE-tər-bur-oh is a city on the Otonabee River in central Ontario, Canada, 125 kilometres (78 mi) northeast of Toronto. The population of the City of Peterborough was 78,698, while the census metropolitan area (CMA) has a population of 118,975 as of the 2011 census. It presently ranks as the 33rd largest CMA in Canada. The current mayor of Peterborough is Daryl Bennett. Peterborough's nickname of "The Electric City" underscores the historical and present day importance of technology and manufacturing as an economic base of the city, which has operations from large multi-national companies such as Siemens, Rolls Royce, and General Electric, and more local technology businesses such as Fisher Gauge and Bryston.

Peterborough is known as the gateway to the Kawarthas, "cottage country", a large recreational region of the province. It is named in honour of Peter Robinson, an early Canadian politician who oversaw the first major immigration to the area. The city is the seat of Peterborough County and since 1983 has been sister city to Ann Arbor, Michigan.