Buncrana in Co Donegal and Dungarvan in Co Waterford have the highest rates of Covid-19 in the country.
A detailed breakdown of coronavirus cases in each Local Electoral Authority (LEA) shows that, as of last Monday, 28 June, Buncrana in Donegal had a 14-day incidence rate of 608.1 per 100,000.
This compares to a national incidence rate of 107 per 100,000.
Dungarvan in Co Waterford had the second highest incidence of Covid, with 600.1 cases per 100,000.
Another Donegal town, Carndonagh, had the third highest rate of infection at 489.3.
Earlier today, 512 new cases of Covid-19 were confirmed to the Department of Health.
This is a 25% rise on the 380 infections reported this day last week (24 June) and a 38% rise on the 313 cases notified two weeks ago (17 June).
It is also the highest daily number of Covid cases in over a month, since 529 new cases were recorded on 4 June.
The Deputy Chief Medical Officer, Dr Ronan Glynn, said the national 14-day incidence rate was now 107 per 100,000. This compares to 98.7 on 28 June.
In a post on Twitter, he said that of the 512 new cases, 216 are Dublin; 63 in Donegal; 26 in Meath; 21 in Kildare and 20 in Limerick.
It comes after Dr Cillian De Gascun said the Delta variant is likely to represent all the cases of Covid-19 in Ireland within two to three weeks.
The director of the National Virus Reference Laboratory told RTÉ's Today with Claire Byrne that preliminary data shows Delta now accounts for 70% of the cases here.
The number of people with the disease in ICU is unchanged since yesterday at 14. In total, there are 46 people in hospital with coronavirus.
In Northern Ireland, one person has died with Covid-19 in the past 24 hours, after a three-week period in which no fatalities were recorded. A further 339 new infections were also reported there.
Earlier today, the Minister for Health, Stephen Donnelly, announced an expansion of the vaccination roll-out programme to younger people.
It will see the 18-34 age group being able to 'opt in' for Janssen or AstraZeneca for earlier vaccination.
Also today, the Government revealed it will buy one million Covid-19 vaccine doses from Romania, in what is seen as a major boost to the vaccination programme.
Taoiseach Micheál Martin held talks with the Romanian President Klaus Iohannis this morning, and it was agreed in principle to purchase one million Pfizer and Moderna vaccines - which are expected to arrive here as soon as possible.
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Meanwhile the HSE National Director for the vaccine roll-out has urged people to be "patient" with pharmacies with regard to booking vaccine appointments, and pharmacies ability to offer vaccines.
Speaking on RTÉ's News At One programme, Damien McCallion said that there are "limited supplies" of the one-shot Janssen (Johnson & Johnson) vaccine, as well as the AstraZeneca vaccine.
Elsewhere, Australia announced a dramatic cut in the number of people who will be allowed to enter the country, as it struggles to contain coronavirus clusters that plunged major cities into lockdown.
With almost half of the nation's population under stay-at-home orders, Prime Minister Scott Morrison said quotas for overseas arrivals would be cut by around 50% to help prevent further outbreaks.
It comes as India revealed it has now recorded over 400,000 coronavirus-related deaths, half of them during a second wave in the past few months that overwhelmed the healthcare system and crematoriums.
The world's second-most populous nation reported 853 deaths in the past 24 hours, health ministry data showed.
