The rate of Covid-19 in Monaghan is over three times the national average.
The county's 14-day incidence rate is just under 1,500 (1,499) cases per 100,000 people.
Donegal, Cavan, and Leitrim are the next worst-affected counties.
Cavan's 14-day incidence rate is 1,028 per 100,000.
The national rate dropped from 531 to 492 in the space of a week.