There are 48 active cases of coronavirus in St George, according to the latest NSW Health figures.
Four new cases have been added in the last 24-hours.
The source of two cases is unknown.
Hurstville and Penshurst postcode areas recorded the highest numbers, six each.
The figures, by residential postcode, up till 8pm on July 12:
Georges River
- 2208: (Kingsgrove): 0
- 2209 (Beverly Hills, Narwee): 4
- 2210 (Lugarno, Peakhurst, Peakhurst Hts): 4
- 2218 (Allawah, Carlton): 6
- 2220 (Hurstville, Hurstville Grove): 6
- 2221 (Blakehurst, Carss Park, Connells Point: 4
- 2222: Penshurst: 6
- 2223 (Mortdale, Oatley): 2
Bayside
- 2205 (Arncliffe, Turrella, Wolli Creek): 4
- 2207 (Bexley, Bardwell Park): 2
- 2216 (Brighton-Le-Sands, Kyeemagh, Rockdale): 3
- 2217 (Monterey, Kogarah, Ramsgate): 2
- 2219 (Dolls Point, Sans Souci, Sandringham): 5
NSW chief health officer Kerry Chant said the emergence of cases in young adults aged 18 - 20 in the Georges River, Bayside and Sutherland Shire council areas was a concern.
"They are spreading it to their closest friends and family, so its crucial young adults limit their social interactions and come forward for testing."
COVID alerts have been issued for specified times at a large number of St George venues.