Liberal Maryam Monsef won this seat in the 2015 election after former Conservative MP Dean Del Mastro decided not to seek re-election. Del Mastro, who resigned after being convicted of election spending violations, was given a one-month jail sentence. Monsef, 34, has served in a number of cabinet posts but is currently the minister of international development and is running again.
Population - 118,176 (Statistics Canada 2016)
Major communities: The city of Peterborough and several neighbouring townships.
Incumbent: Maryam Monsef (Liberal)
Main challengers: The president of a local innovation cluster, Michael A. Skinner, is running for the Conservative party. Candace Shaw, the former executive director of the Peterbough Folk Festival, will represent the NDP. Andrew MacGregor, a financial adviser, is running for the Green party, while Alex Murphy is running for the People's Party of Canada.
Election history: This bellwether riding has only bucked the trend of electing a government MP once since 1980.
Fun fact: Peterborough became the first Canadian city with electric street lighting on May 24, 1884.