The Ballybay-Clones area has the highest rate of Covid-19 in the Northern Sound region according to new figures.
It comes as the Department of Health announced another 10 new cases in the county, with six more in Cavan.
The Castleblayney-Carrickmacross area is the only one in the region to report a 14 day incidence rate below the national average.
It has a rate of fewer than five cases per 100,000 - one of the lowest rates in the country.
The Ballybay-Clones area has a rate of 168, followed Monaghan MD area with 163.
Rates in the County Cavan MDs are slightly lower than those in Monaghan.
The Cavan-Belturbet and Bailieborough-Cootehill areas have rates of 123, with a rate of 112 in the Ballyjamesduff MD.
However, these figures only cover cases up to Monday of this week.
Both counties have seen an increasing number of cases recorded this week, with 25 in Cavan on Wednesday alone.
This new data looks at the 14-day incidence rate for coronavirus in local electoral areas between December 1st and 14th.
During that period, the Republic's rate was just under 85 per 100,000 people.
But some areas of the country continue to have rates of several times that - especially Co Donegal. The Carndonagh LEA is the worst in the country, at nearly 796.
Two other areas in Donegal have rates of over three times the national average. Milford LEA's is 276 and Buncrana's is 273.
The second worst in the country was Claremorris LEA in Co Mayo, at 409.
The third highest was Muinebeag in Co Carlow, at 326, followed by Castlecomer in Co Kilkenny, at 305.