As for the Jebusites, the inhabitants of Jerusalem, the children of Judah couldn't drive them out: but the Jebusites dwell with the children of Judah at Jerusalem to this day.
Judah was the southernmost tribe west of the Jordan. Caleb’s family and the Simeonites lived within Judah’s territory. Simeon was the smallest tribe except Levi, and lost its territorial identity within Judah shortly after the conquest (cf. Genesis 49:5-7). For this reason some maps of the tribal allotments do not include Simeon.