Latin America is also a "high-risk zone" -- seven journalists and a media aide died there last year.
RSF said in its annual report, issued ahead of World Press Freedom Day tomorrow, that an estimated 1,300 journalists were attacked or threatened around the world.
Conditions also deteriorated in the states of the former Soviet Union, in particular in Azerbaijan, Belarus, Russia, and Uzbekistan.
Iran remained the biggest prison for reporters in the Mideast region, RSF said.
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