New data reveals the devastating march of COVID-19 across NSW, showing the date and postcode of every case recorded for the first time.

NSW Health recorded its first case of the virus on January 22. It was a Burwood resident who had returned to Sydney from Wuhan.

The spread of COVID-19 across Sydney since the first cases in January. Credit:Taylor Denny

Following that case, the virus spread through Sydney and beyond, with cases confirmed along the NSW coast and in regional areas over the next two months.

The Herald analysis shows that postcodes along the eastern beaches and northern suburbs are home to the most infected residents.