The gmina covers an area of 144.79 square kilometres (55.9 sq mi), and as of 2006 its total population is 3,884.

The gmina contains part of the protected area called Gostynin-Włocławek Landscape Park.

Archaeological excavations indicate that the gmina of Nowy Duninów was inhabited in the Neolithic by early agriculturalists, as well as hunters and fishermen.

[1] An early significant historical event was the creation at Duninów of a pontoon bridge across the Vistula for the troops of Władysław II Jagiełło in 1414.

The troops were returning from the Hunger War, an expedition against the Teutonic Knights.