The latest report from the Health Protection Surveillance Centre shows the nationwide 14-day incidence rate per 100,000 people has seen a slight drop - the first time in more than three weeks - to just over 107.
Mayo has the lowest incidence rate in the country - at 30.6 per 100,00 people.
Donegal remains the county with the highest incidence rate of 265, followed by Monaghan on 177, Dublin with 162 and Roscommon on 159.
Two other counties have an incidence rate of more than 100 - Longford and Cork, while Galway is at 89.
The 14-day incidence rate in Sligo is almost 55, with 31 in Leitrim - well below the national average of 107.