 The gmina covers an area of , and as of 2006 its total population is 15,893 (17,506 in 2014).Gmina Siedlce contains the villages and settlements of Białki, Biel, Błogoszcz, Chodów, Golice, Golice-Kolonia, Grabianów, Grubale, Jagodnia, Joachimów, Nowe Iganie, Nowe Opole, Opole Świerczyna, Osiny, Ostrówek, Pruszyn, Pruszyn-Pieńki, Pruszynek, Purzec, Pustki, Rakowiec, Stare Iganie, Stare Opole, Stok Lacki, Stok Lacki-Folwark, Strzała, Topórek, Ujrzanów, Wólka Leśna, Wołyńce, Wołyńce-Kolonia, Żabokliki, Żabokliki-Kolonia, Żelków-Kolonia and Żytnia.Gmina Siedlce is bordered by the city of Siedlce and by the gminas of Kotuń, Mokobody, Mordy, Skórzec, Sokołów Podlaski, Suchożebry, Wiśniew and Zbuczyn.