Waterloo is a city in Southern Ontario, Canada. It is the smallest of the three cities in the Regional Municipality of Waterloo, and is adjacent to the city of Kitchener. Kitchener and Waterloo are often jointly referred to as "Kitchener-Waterloo" (K-W), or "the Twin Cities", although they have separate city governments. There have been several attempts to amalgamate the two cities, but none have been successful.
The reported population for the city can vary depending on how temporary residents at Waterloo's two universities are counted. At the time of the 2006 census, Waterloo had a population of 97,475. That number as with all populations counts nationally does not include post-secondary students who are temporary residents. The city's total population at the end of 2006 with over 20,000 non-resident post-secondary students included was 114,700. As of 2009 the City of Waterloo reported the population including temporary residents to be 121,700 on their website.