In the 2011 census, the population was 3,732, with 60.13% declaring themselves Croats, 29.69% as Bosniaks, and 3.32% as Serbs.

[3][4] The village lies directly across the Sava river from the city of Brčko in Bosnia and Herzegovina.

During the Bosnian War, many Bosniak and Croat citizens of Brčko lived as refugees in Gunja.

Gunja was heavily hit by the 2014 Southeast Europe floods, with estimated property damage in excess of €50 million.

[5][6] Directly elected minority councils and representatives are tasked with consulting tasks for the local or regional authorities in which they are advocating for minority rights and interests, integration into public life and participation in the management of local affairs.