Joshua 12:7-24

7And these are the kings of the land that Joshua and the Israelites conquered beyond the Jordan to the west, from Baal-gad in the Valley of Lebanon to Mount Halak, which rises toward Seir (according to the allotments to the tribes of Israel, Joshua gave them as an inheritance 8the hill country, the foothills,1 the Arabah, the slopes, the wilderness, and the Negev—the lands of the Hittites, Amorites, Canaanites, Perizzites, Hivites, and Jebusites):

9the king of Jericho, one; the king of Ai, which is near Bethel, one; 10the king of Jerusalem, one; the king of Hebron, one; 11the king of Jarmuth, one; the king of Lachish, one; 12the king of Eglon, one; the king of Gezer, one; 13the king of Debir, one; the king of Geder, one; 14the king of Hormah, one; the king of Arad, one; 15the king of Libnah, one; the king of Adullam, one; 16the king of Makkedah, one; the king of Bethel, one; 17the king of Tappuah, one; the king of Hepher, one; 18the king of Aphek, one; the king of Lasharon, one; 19the king of Madon, one; the king of Hazor, one; 20the king of Shimron-meron, one; the king of Achshaph, one; 21the king of Taanach, one; the king of Megiddo, one; 22the king of Kedesh, one; the king of Jokneam in Carmel, one; 23the king of Dor in Naphath-dor,2 one; the king of Goiim in Gilgal,3 one; 24and the king of Tirzah, one.

So there were thirty-one kings in all.