Martinci is located in the City of Buzet, in Istra County at an elevation of 280 meters above sea level and it covers the area of 1.48 km² (0.57 sq. miles). According to the 2011 census report, there were 20 inhabitants. It is entirely populated by Croats. Nearby places: Račice, Prodani, Rimnjak, Krušvari, Račički Brijeg, Podkuk, Kosoriga, Klarići, Kotli and Medveje.