A local electoral area in Galway has a 14-day incidence rate of Covid-19 at least three times the national average.
Galway City Central LEA had a rate of 951 per 100,000 people in the two-week period that ended on Monday, compared to the national average of 269.
This has increased from last week when the area had a rate of 382.
Public health doctors in Galway last week identified several Covid outbreaks among third-level students in the city.
Galway city councillor Martina O'Connor says there are two reasons why her area's the worst in the country.
Meanwhile, the worst-hit electoral area in Mayo is the Swinford LEA with an incidence rate of 359, followed by Castlebar with 357, Claremorris with 324 cases per 100,000, all above the national average.
Westport rate stands at 234, its 151 in Belmullet and 108 in Ballina per 100,000 people.