Source Data Reference for:

City = Ottawa
Time = 1850

City	Year	Size	Size Comment	Year Comment	Author	Title	Location
Ottawa	1850		founded		n/a	http://en.wikipedia.org/wiki/List_of_North_American_cities_by_year_of_foundation	n/a
Ottawa	1861	18,000			Tertius Chandler	Four thousand years of urban growth	p54