Okrug Donji is located in the municipality Okrug, in Split-Dalmatia County at an elevation of 2 meters above sea level and it covers the area of 2.78 km² (1.07 sq. miles). According to the 2011 census report, there were 265 inhabitants. It is predominantly populated by Croats (95%), but also Serbs (3%). Nearby places: Seget Donji, Seget Vranjica, Trogir, Okrug Gornji, Seget Gornji, Mastrinka, Žedno, Vrsine, Arbanija and Divulje.