The lockdown for the Dubbo local government area has been extended until August 28.
NSW Premier Gladys Berejiklian made the announcement on Thursday morning.
The lockdown for regional NSW was scheduled to end this weekend. However, Ms Berejiklian said she was taking a "precautionary response" and bringing the regional NSW lockdown into line with the Sydney lockdown.
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It comes as NSW records 681 new locally-acquired COVID-19 cases and one death in the 24 hours to 8pm on Wednesday.
The Western NSW Local Health District recorded 25 new cases. It brings the total to 167.
In Dubbo alone there were 20 new cases
Ms Berejiklian said she was still concerned about western NSW, particularly in Dubbo and Wilcannia.
However, overall she said she could see the light at the end of the tunnel thanks to the high level of vaccination.
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