A woman in her 70s who had been in close contact with another confirmed case and is self-isolating. The fifth is only listed as "pending".
One of the men in his 60s, who had traveled to Spain, is in hospital, as is the woman in her 60s, who had been to Dubai and Egypt. He is self-isolating, according to health officials.
A Quebec resident who works in Renfrew County has also tested positive, and their co-workers asked to self-isolate.
-Confirmed coronavirus cases crossed 377,000 across 194 countries and territories.
Ontario confirmed 170 new coronavirus cases on Thursday.
Ottawa Public Health issued a statement late Wednesday afternoon, saying the man had been living at home and had developed a fever on March 15.
Local health officials have warned repeatedly that the total number of COVID-19 cases in the city is likely much higher - probably in the thousands - because of the limitation around testing. Vera Etches, has said that as many as 4,000 people could now have COVID-19 in Ottawa, and studies from China suggest that more than 80 per cent of those infected will recover without medical intervention. The province now has 837 active cases.
A man in his 90s with no travel history is the first person to die from COVID-19 in Ottawa.
Almost 11,000 test results are pending in Ontario.