New data from the Health Protection Surveillance Centre shows the country's 14-day incidence rate has risen to nearly 146 per 100,000 people.
Donegal's is by far the country's highest county with a figure of 446 per 100,000 - after 710 cases in the space of two weeks.
Sligo is the next highest, with an incidence rate of 223 - while Louth and Limerick also have rates of above 200.
Five counties have rates of less than 70 cases per 100,000 people - Longford, Carlow, Cork, Kilkenny and Tipperary.
Tipperary's is the lowest, at 54.