This is according to a report by Global Rights, an international non-governmental organisation championing human rights capacity building.
The report shows that 3,188 Nigerians, including 2,707 civilians and 481 security operatives were killed.
The report, presented to journalists by a former chairman of the National Human Rights Commission, Chidi Odinkalu and a co-convener of the Bring-Back-Our-Girls campaigner, Aisha Yesufu, said this was due to violent incidents in the country.
The reports showed Borno State topping the casualty figure list with 728; while Zamfara, Kaduna, Katsina and Taraba recorded 450, 280, 254 and 181 respectively.
An in-depth analysis of the report showed that violence-related deaths were recorded in every state in Nigeria with Abia notably the least impacted, with one death recorded.