More than six million people travelled to Ireland in the first nine months of the year, according to the Central Statistics Office.
The figure is 413,800 (6.8%) more than in the same period of 2012.
Over 2.1 million of those trips were made between August and October, which was 191,100 (8.9%) higher than the figure for the same quarter of last year.
More than one million trips were made by visitors from North America in the first nine months of 2013, which was up 12.7% on the same period of last year.
Nearly 250,000 trips to Ireland came from Britain, which was an increase of 4.8%.
Meanwhile, the rest of Europe accounted for 2.15 million of the trips between January and October, an increase of 5.3%.
Overseas trips made by Irish residents fell slightly, down by almost 19,000 (0.3%) to 5.49 million, during the same nine-month period.