The New York-based Committee to Protect Journalists (CPJ) updated its toll less than two weeks after reporting that 52 journalists had died on the job.
Syria was the deadliest assignment, resulting in 28 deaths this year, CPJ said. Ten journalists were killed in Iraq, including five in December alone.
The updated figures include the deadly December bombing of an Iraqi TV station, and additional killings in Iraq, Syria and India.
The toll is based on what CPJ calls "a rigorous research process" to verify whether journalists were killed as a direct result of their work.
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More than a third of the journalists were killed in combat or crossfire, while 20 percent died during some other type of dangerous assignment.
At least 63 journalists have perished covering the civil war in Syria since it broke out in 2011.
"Yet the huge number of deaths in Syria does not tell the complete story of the danger to journalists there," CPJ's Elana Beiser said in a blog post yesterday.
The third deadliest country for journalists in 2013 was Egypt with six deaths, followed by Pakistan with five, Somalia with four, India, the Philippines and Brazil with three each and Russia and Mali with two each. Turkey, Bangladesh, Colombia and Libya each saw one journalist death, CPJ said.