Over 642,278 people visited Castletown House and Parklands last year.
That number could be considerably higher than that as digital counters are not in place at all entrances to the estate. In addition, 13,397 visitors availed of the Guided Tours in 2018.
Labour general election candidate Emmet Stagg said he was in contact with the Minister for Public Expenditure and Reform about the number of visitors.
Mr Stagg welcomed the 2018 figures and stated that there is obviously great interest in the historic house and parklands not only from locals enjoying the facilities daily but from visitors from all over Ireland and the world.
"Castletown was built in the 1720's and is an extraordinary part of our cultural inheritance. Following transfer to the State in 1994, then Labour Party Arts, Culture and Gaeltacht Minister Michael D. Higgins, provided funding to enable an extensive restoration of the House and it is now widely available to the public," he said.
"The visitor numbers stated Mr. Stagg prove how valuable it is. You can take guided tours of the House or walk and explore the restored 18th century designed parklands and river walks, or relax and have a Coffee or lunch at the Courtyard Café situated in the 18th century kitchen wing."
In relation to works planned at Castletown House in 2019, the Minister advised Mr Stagg that the OPW are seeking planning permission for further works to the farmyard buildings in order to integrate this area of the estate into the visitor experience at Castletown.