Mastrinka is located in the City of Trogir, in Split-Dalmatia County at an elevation of 2 meters above sea level and it covers the area of 5.16 km² (1.99 sq. miles). According to the 2011 census report, there were 941 inhabitants. It is predominantly populated by Croats (96%), but also. Nearby places: Žedno, Arbanija, Divulje, Okrug Gornji, Trogir, Plano, Slatine, Seget Donji, Okrug Donji and Kaštel Štafilić.