Toponym: Gradusa Posavska, Sunja.
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Gradusa Posavska is located in the municipality Sunja, in Sisak-Moslavina County at an elevation of 98 meters above sea level and it covers the area of 2.63 km² (1.02 sq. miles). According to the 2011 census report, there were 91 inhabitants. It is entirely populated by Croats. Nearby places: Lukavec Posavski, Gornja Letina, Greda Sunjska, Petrinjci, Gušće, Sunja, Brđani Cesta, Donja Letina, Drljača and Brđani Kosa.
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# Today In the past 1. Marić Jergović 2. Jakić Malović 3. Pavušek Marić 4. Jergović Ferdebar 5. Ferdebar Hrastovski 6. Hrastovski Jurković 7. Kozarić Kovačević 8. Dokman Pavušek 9. Gvardijan Gvardijan 10. Terzić Jakić 11. Šafar Jureković 12. Žinić Kihalić 13. Babić Kudlek 14. Ercegović Merkaš 15. Grubić Mikulić 16. Hubelić Pranjić 17. Jureković Rožanković 18. Knežić Rožić 19. Merkaš Vranešić 20. Pranjić