According to a CPJ statement, as of December 1, 2016, there were 259 journalists in jail around the world.
Turkey had at least 81 journalists behind bars, according to CPJ's records, the highest number in any one country at a time--and every one of them faces anti-state charges.
Dozens of other journalists are imprisoned in Turkey, but CPJ was unable to confirm a direct link to their work.
Egypt, Eritrea, and Ethiopia are third, fourth and fifth worst jailers of journalists, respectively.
Combined, the top five countries on CPJ's census were responsible for jailing more than two-thirds of all journalists in prison worldwide.
"Journalists working to gather and share information are performing a public service and their rights are protected under international law. It is shocking therefore that so many governments are violating their international commitments by jailing journalists and suppressing critical speech," said CPJ Executive Director Joel Simon.
"Turkey is at the vanguard of this authoritarian trend. Every day that Turkey's journalists languish in jail in violation of that country's own laws, Turkey's standing in the world is diminished."
This year marks the first time since 2008 that Iran was not among the top five worst jailers, as many of those sentenced in the 2009 post-election crackdown have served their sentences and been released.
The Americas region, which had no jailed journalists in 2015, appears on this year's census with a total of four journalists in prison.
About 20 percent of journalists in prison are freelancers--a percentage that has steadily declined since 2011.
The vast majority of journalists in jail worked online and/or in print, while about 14 percent are broadcast journalists.
The prison census accounts only for journalists in government custody and does not include those who have disappeared or are held captive by non-state groups.
The CPJ estimates that at least 40 journalists are missing or kidnapped in the Middle East and North Africa.