Toponym: Opatovac, Cernik.
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Opatovac is located in the municipality Cernik, in Slavonski Brod-Posavina County at an elevation of 213 meters above sea level and it covers the area of 8.80 km² (3.40 sq. miles). According to the 2011 census report, there were 331 inhabitants. It is entirely populated by Croats. Nearby places: Banićevac, Baćin Dol, Sinlije, Šumetlica, Podvrško, Opršinac, Ruševac, Golobrdac, Čečavački Vučjak and Bukovica.
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# Today In the past 1. Curić Curić 2. Jurković Jurković 3. Marjanović Mandušić 4. Mandušić Marjanović 5. Gudović Gudović 6. Josipović Josipović 7. Franić Franić 8. Šarić Franjić 9. Franjić Marijanović 10. Marijanović Šarić 11. Marinović Marinović 12. Mihaljević Orešković 13. Trobić Trobić 14. Bradašić 15. Barjaktarević 16. Jakić 17. Paulić 18. Baković 19. Barun 20. Galijašević