NSW has been effectively isolated from the rest of Australia after other states and territories closed borders or imposed 14-day mandatory quarantine rules.
Neighbouring Victoria state, which is also battling new cases in state capital Melbourne, on Monday reported three local cases bringing the active cases in the state to 36.
New South Wales maintained a steady downward trend in COVID-19 cases as it attempts to contain an outbreak in capital Sydney, reporting nine fresh local infections versus eight on Wednesday.
Australia has avoided the worst of the pandemic due to border closures, lockdowns, widespread testing and social distancing. It has recorded a total of around 28,100 infections.
"As the virus seemed to be contained in terms of community transmission, our most exposed areas are principally around our borders... we may be an island but we are not totally isolated from the pandemic that is raging across the world," he said.