At its lowest point, along the waterfront, Toronto is 76.5 meters above sea level. At its highest point, it's 209 metres above sea level. http://www.toronto.ca/toronto_facts/geography.htm
Sea Level is 0 feet
There is no sea in Nashville. However, if you mean the elevation, then it is 591 ft.
Colorado is an average of 6,800 feet above sea level..
Wikipedia says 358 feet