Kostkowo, Warmian-Masurian Voivodeship

Kostkowo is a settlement in the administrative district of Gmina Rybno, within Działdowo County, Warmian-Masurian Voivodeship, in northern Poland. It lies approximately 3 km south-west of Rybno, 24 km north-west of Działdowo, and 61 km south-west of the regional capital Olsztyn.