In the 2011 census, there were 4,264 (74.18%) Croats and 1,280 (22.27%) Serbs.[4]
Politics
Minority councils and representatives
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.[5] At the 2023 Croatian national minorities councils and representatives electionsSerbs of Croatia fulfilled legal requirements to elect 10 members minority council of the Municipality of Sunja.[6]
History
This section needs to be updated. Please help update this article to reflect recent events or newly available information.(April 2015)
People lived in the area between the Sava and Sunja rivers even in prehistoric times. This is proven by the archaeological site on the hill called Pleće, where the remains of a former fishing settlement and pottery fragments were found. In the 4th century BC, Celts belonging to the "Segestani" tribe broke into the territory inhabited by the Illyrians. They founded the most important city in the region, Segestica, located northwest of here. The city was conquered by the Roman army led by Octavian in the i. e. He occupied it between 35 BC and 33 BC in his campaign against the Iapodes of the Eastern Alps during his conquest of Illyria. He then established a military camp opposite the Celtic city on the left bank of Kulpa, which he named Siscia. Two important Roman roads led from Siscia through the area of today's Sunja, one led to what was then Sirmium, the other to Salona.
The Slavs arrived in this region in the 7th century during Avar era. After demise of Avar rule, March of Pannonia was founded. After demise of this march, it was initially ruled by Franks. It was finally part of Kingdom of Croatia. After Coloman defeating Petar Snačić, the last Croatian king, Croatia entered a personal union with Kingdom of Hungary according to Pacta convent in 1102.
Sunja was conquered by Ottomans along with Kostajnica in 1556. The population fled from the constant fighting to the safer Western Hungary, mainly to the area of today's Burgenland, others were captured by the Turks. During Turkish rule Sunja was part of Greda nahiya in Bosnia Eyalet. Turkish rule lasted till Austrian conquest in 1687. It was part of Military Frontier till 1881 except French rule as part of Illyrian Provinces between 1809 and 1814.
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