The last census in the Republic of Ireland was in 2006. You will find figures for populations of the counties and their cities in the list at the link below, and also a range of other information. All this detail is on the Central Statistics Office website. Details for the 6 counties of Northern Ireland would not be covered, just the 26 counties in the Republic of Ireland.
County Leitrim has the smallest population in Ireland.
Smallest county population wise in Ireland is Leitrim 27-28 thousand.
Dublin.
Dublin.
Dundalk is the county town of County Louth in the Republic of Ireland. It is the largest town in Ireland by population and area.
County Leitrim is the least populated at around 28,500 people.
In the 2006 census of Ireland, the population of county Kildare was 186,335.
That would depend on what criteria you judge "main county" by. Dublin would be the popular answer. It contains the largest city and the capital of Ireland and it has the largest population, but it is the third smallest county in Ireland. Cork is the largest county.
It is common knowledge that Castlebar is the county town of County Mayo, Ireland. It is in the middle of the county and is its largest town by population.
The population of Fintona in County Tyrone, Northern Ireland, is approximately 1,850 people.
The last census in Ireland was done in 2006. At that time the population of Waterford was 107,961. That was made up of 45,748 in the city and 62,213 in the county.
It depends on the population of the county