Maasland (population: 6,844), covers an area of 24.42 km² (of which 0.64 km² water).
Schipluiden (population: 11,173), covers an area of 30.00 km² (of which 0.39 km² water).
The municipality comprises settlements with these two names, as well as Den Hoorn and 't Woudt. Midden-Delfland itself is not the name of a settlement.