The CSO figures show that national prices were 14.9% higher in August compared to August 2013 - the 15th annual increase in a row.
Residential prices across the country rose by 2.3% in the month of August compared to July.
Dublin saw property price increases of 3.5% in the month, while they were 25.1% higher than a year ago.
In the rest of the country, prices rose by 0.8% in August on a monthly basis, while they were 5.6% higher than this time last year.
The CSO said that Dublin house prices rose by 3.5% in the month of August, and were 24.7% higher compared to the same month last year.
It also noted that Dublin apartment prices were 32.6% higher on an annual basis, but it added that apartment transactions are based on low volume levels and therefore suffer from greater volatility.
Today's figures show that house prices in Dublin are more than 39% lower than at the peak of the market at the start of 2007. Dublin apartments are 45.8% lower than their 2007 peak.
The price of residential properties outside of Dublin are 44.6% lower than their highest level in September 2007.
Today's CSO figures are based on mortgage draw-downs and do not include cash transactions.
But they show that the number of transactions increased markedly over the past year. Between January and July 2013, 11,800 houses and apartments changed hands. During the same time this year there were almost 20,000 transactions.
Alan McQuaid, chief economist with Merrion, said August's numbers represented the 15th annual increase in a row.
He pointed out that the underlying housing market was a lot more robust than the official data would suggest as the figures are based solely on mortgage draw-downs.
"Although cash sales are not as high now compared with the start of the year, they are still significant, with three to four of every ten transactions a cash purchase," he said.
"The generally improving economic backdrop should help to sustain the house price recovery in the short-term even with limited credit availability for potential buyers."
"Longer-term, however, the flow of credit needs to be a lot higher than it is now. Following an average increase of 1.8% in house prices last year, we are now looking for an increase of around 13.5% in 2014."