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The municipality is divided in 10 naselja:
to be expanded
Until 1918, Oriovac (named ORIOWACZ before 1850) was part of the Austrian monarchy (Kingdom of Croatia-Slavonia after the compromise of 1867), in the Slavonian Military Frontier, Gradiskaner Regiment N°VIII before its dissolution in 1881.
- Handbook of Austria and Lombardy-Venetia Cancellations on the Postage Stamp Issues 1850-1864, by Edwin MUELLER, 1961.
- "Population contingents, by towns/municipalities, Census 2001: County of Slavonski Brod-Posavina". Croatian Bureau of Statistics. Retrieved November 23, 2010.
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