Toponym: Gromacnik, Sibinj.
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Gromačnik is located in the municipality Sibinj, in Slavonski Brod-Posavina County at an elevation of 90 meters above sea level and it covers the area of 6.32 km² (2.44 sq. miles). According to the 2011 census report, there were 555 inhabitants. It is predominantly populated by Croats (98%), but also. Nearby places: Brodski Varoš, Bartolovci, Slobodnica, Završje, Sibinj, Gornji Andrijevci, Slavonski Brod, Podvinje, Glogovica and Podcrkavlje.
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# Today In the past 1. Čengić Čengić 2. Tomakić Gruičić 3. Devčić Pavelić 4. Gruičić Sekulić 5. Terzić Tomakić 6. Holub Đermić 7. Đermić Budisavljević 8. Azapović Devčić 9. Brkić Grujičić 10. Serba Kasprek 11. Sigurnjak Miletić 12. Stanković Opačak 13. Bida Župan 14. Bajušić Azapović 15. Filajdić Bida 16. Fran Bosanac 17. Lasić Butković 18. Lovaković Ećimović 19. Majstorić Fran 20. Petrović Grgić