Seven new cases of COVID-19 were diagnosed between 8pm on 17 June and 8pm on 18 June.
One previously confirmed case has been excluded after further testing, meaning the total number of cases in NSW is now 3,143.
All new cases are returned travellers in hotel quarantine.
NSW recorded its second-highest test numbers, with 17,363 tests carried out in the reporting period, after the record-high of 17,392 tests in the previous 24 hours. Almost 700,000 COVID-19 tests have now been carried out in NSW.
NSW Health would like to thank those with symptoms for coming forward, getting tested and ensuring cases in the community are identified as quickly as possible.
There are currently 53 COVID-19 cases being treated by NSW Health, none in intensive care. In NSW, 2,770 people are known to have recovered from COVID-19.
Since 29 March 2020, 2,956 symptomatic travellers have been tested in hotels, with 99 (3 per cent) found positive. Travellers are also screened at day 10 of quarantine. Since this screening began on 15 May, 9,148 returned travellers have been screened at day 10 of quarantine with 38 found positive.
NSW Health is asking anyone who has been unwell or has flu-like symptoms to seek testing via their GP or by visiting one of the COVID-19 clinics. A full list of COVID-19 testing clinics is available at locations and opening hours of COVID-19 clinics.
The virus may still be circulating in the community. People with mild symptoms or those who show no obvious symptoms can unknowingly pass it to others.
NSW Health is urging anyone feeling unwell – even with the mildest of symptoms such as a runny nose or scratchy throat – or have a loss of smell and taste to isolate from others and get tested.
Counts reported for a particular day may vary over time with ongoing enhanced surveillance activities.
Watch the video update.