Giżycko is a town in northeastern Poland with 28,597 inhabitants as of December 2021. It is situated between Lake Kisajno and Lake Niego…Giżycko is a town in northeastern Poland with 28,597 inhabitants as of December 2021. It is situated between Lake Kisajno and Lake Niegocin in the region of Masuria, within the Warmian-Masurian Voivodeship. It is the seat of Giżycko County.