begins, with an elevation of 99 m. The city's total population in 2021 was 40,185 of which 27,886 live in the urban settlement (naselje).

Sisak is the administrative centre of the Sisak-Moslavina County, Croatia's biggest river port and a centre of river shipping industry (Dunavski Lloyd). It lies on the D36 state road and the Zagreb-Sisak-Novska