Glen Innes residents are in lockdown for seven days after a known COVID-19 case was active in the community.
Member for Northern Tablelands Adam Marshall announced the decision on social media early this afternoon.
The infectious person had recently visited Sydney for several days before testing positive in the latest reporting period and was infectious in the community.
There are three exposure sites in the town, each visited by the person on Tuesday.
There had been several positive detections of virus fragments in the town's sewage catchment ahead of the case being confirmed.
Mayor Carol Sparks said her community was disappointed and a bit tired from the ups and downs of lockdown.
"Everybody's just been waiting to hear the news. We pretty much knew it was coming," she said.
"We were so relived to be finally out of lockdown, but it's for our own good and we have to abide by health rules."
Ms Sparks said the latest lockdown would alert people to the need to get vaccinated and to get tested if they had symptoms.
There is some concern the lockdown will have an effect on the town's border bubble status, but Ms Sparks said she had not yet spoken to the cross-border commissioner and would be watching as the situation unfolded.
Owner of the Railway Tavern in Glen Innes, Nathan Sanderson, said this lockdown was particularly frustrating because of the mixed messaging.
"We understand we have to do it but to find out how we did after so much yes, no, yes, no, it's just frustrating," he said.
Owner and artist at Gawura Gallery Lloyd Hornsby said his business would be unaffected by the lockdown, as they had stayed shut when restrictions eased.
Deputy Premier John Barilaro today met more than 100 regional NSW mayors.
Ken Keith, the Mayor of Parkes and chair of the Country Mayors Association of NSW, said they discussed plans for further vaccination clinics and potential financial support for businesses and tourism operators affected by restrictions.
Mr Keith said there was a difference between one case in a country town and one in a major city.
Meanwhile, Uralla residents are being urged to get tested after the town recorded a positive reading for COVID fragments in its most recent sewage test.
