Kielce is a city in south-central Poland and the capital of the Świętokrzyskie Voivodeship. In 2021, it had 192,468 inhabitants. Th…Kielce is a city in south-central Poland and the capital of the Świętokrzyskie Voivodeship. In 2021, it had 192,468 inhabitants. The city is in the middle of the Świętokrzyskie Mountains, on the banks of the Silnica River, in the northern part of the historical Polish province of Lesser Poland.