Residents accounted for 75.6% of total arrivals at accommodation establishments in October, while foreigners made up for the reminder 24.4%.
The vast majority of foreign visitors (79.8%) came from Europe, the data showed.
Bucharest and county capitals attracted most tourists in October (81.6% of arrivals at accommodation structures), followed by other localities and tourist destinations (9.9%) and mountain resorts (5.2%).
Border crossings of foreigners to Romania declined 3% on the year in October, while Romanian tourist departures aboard decreased 3.9%, INS said.
In the first 10 months of 2013, tourist arrivals at Romanian accommodation establishments rose 2.9% compared with the year-earlier period, while overnight accommodations edged up 0.1%.