Number of inhabitants (1 Jan 2003): 17.336; area: 62,37 km². Settlements:
Middelharnis (seat), Nieuwe-Tonge, Sommelsdijk, Stad aan 't Haringvliet.
Middelharnis was formed in 1966 by the merger of Middelharnis, Nieuwe
Tonge, Sommelsdijk, and Stad aan 't Haringvliet.