NSW has recorded 78 locally acquired cases of COVID-19, one of which is from the Illawarra.
Statewide, 27 of the new cases in Tuesday's COVID update were infectious in the community.
Investigations are continuing into two other cases in the Wollongong local government area, announced on Monday.
According to NSW Health's heat map of COVID cases, the two local cases live in the 2530 postcode which includes several suburbs such as Dapto and Horsley.
Of the 78 locally acquired cases reported to 8pm last night, 52 are from South Western Sydney Local Health District (LHD), 11 are from Western Sydney LHD, three are from Sydney LHD, 11 are from South Eastern Sydney LHD, and one is from Illawarra Shoalhaven LHD.
A second case has also been confirmed on the Southern Highlands, in Mittagong.
However, he said it was not believed that the case "presented a significant risk to the community" and "investigations were continuing into the case".
It follows on from news earlier Monday that a COVID case had been detected in a Campbelltown-based doctor who lived in Burradoo.
Premier Gladys Berejiklian said nearly 63,000 people came forward to be tested on Monday.
She said the new testing requirements for people working outside Greater Sydney had uncovered a number of asymptomatic positive cases.
Ms Berejiklian said it was positive the overall number of cases had dropped but work needs to be done to reduce the number of people in the community while infectious.
"I'm convinced if we all work together and focus on those key areas of concern... we will get through this," Ms Berejiklian said.
It comes as Victoria recorded 13 cases of COVID-19, four of which were announced yesterday.
One of the cases has not been linked to an existing cluster.
South Australia will move into a full seven-day lockdown on Tuesday afternoon after a cluster of COVID-19 cases grew to five.