Eight districts have recorded fewer than five cases of Covid-19 in the latest local data released on the pandemic, which represents four times as many areas as last week.
Three of them reside in County Mayo.
But one part of Donegal still has three times the national average infection rates.
Three local electoral areas in Co Mayo had some of the lowest rates of Covid-19 anywhere in the country during the two weeks up to Monday night.
In all there were eight local districts with fewer than five cases during that time -- among them, Westport, Belmullet and Swinford.
Bantry West in Co Cork, Muinebeag in Co Carlow, Ballinasloe in Co Galway and Cahir in Co Tipperary were also below this level, as was Carrickmacross in Co Monaghan.
But just over the county line from there is Dundalk South -- where there were 97 more cases in the latest reporting period -- or 299 per hundred thousand.
It's behind only the parts of North Donegal with have had the highest infection rates throughout the second wave.
Milford still has more than three times the national average rate at 355 per hundred thousand -- and in the Letterkenny area it's 305.
These areas border Derry and Strabane, where infection rates remain high even after being overtaken by parts of Belfast city in recent weeks.
Ballymun-Finglas was highest in Dublin at 192.
The South Central area of Cork is worst in the city at 199.
Limerick City West was higher again at 346.6.
While Waterford's South City was again the worst of any urban area at 284 per hundred thousand.