Residents accounted for 78.3% of total arrivals at accommodation establishments in 2013, while foreigners made up for the reminder 21.7%.
The vast majority of foreign visitors (80.5%) came from Europe, the data showed.
Bucharest and county capitals attracted most tourists in 2013, followed by other localities and tourist destinations and mountain resorts.
Border crossings of foreigners to Romania increased 1% on the year in 2013, while Romanian tourist departures aboard rose 1.9%, INS said.