Kropinjak is located in the municipality Lanišće, in Istra County at an elevation of 660 meters above sea level and it covers the area of 2.70 km² (1.04 sq. miles). According to the 2011 census report, there were 4 inhabitants. It is entirely populated by Croats. Nearby places: Klenovšćak, Brest, Slum, Trstenik, Dane, Gornja Nugla, Rašpor, Počekaji, Strana and Prapoće.