|Easton's Bible Dictionary|
House of Dagon.
(1.) A city in the low country or plain of Judah, near Philistia (Joshua 15:41); the modern Beit Degan, about 5 miles from Lydda.
(2.) A city near the south-east border of Asher (Joshua 19:27). It was a Philistine colony. It is identical with the modern ruined village of Tell D'auk.
Int. Standard Bible Encyclopedia
beth-da'-gon (bethdaghon; Bethdagon):
(1) A town in the Shephelah of Judah named with Gederoth, Naamah, and Makkedah (Joshua 15:41). It may be represented by the modern Beit Dijan, about 6 miles Southeast of Jaffa. This however is a modern site, and not in the Shephelah. Nearly 2 miles to the south is Khirbet Dajan, a Roman site. The connection in which it occurs leads us to expect a position farther Southeast
(2) A city on the border of Asher (Joshua 19:27) which Conder would identify with Tell D'auk, near the mouth of the Belus, in the plan of Acre.
The name seems to have been of frequent occurrence. There is a Beit Dejan about 6 miles East of Nablus, and Josephus speaks of a fortress called Dagon above Jericho (Ant., XII, viii, 1; BJ, I, ii, 3). This would seem to indicate a widespread worship of Dagon. But the name may mean "house of corn."
Beth-dagon (2 Occurrences)
Joshua 15:41 and Gederoth, Beth-dagon, and Naamah, and Makkedah; sixteen cities with their villages. (ASV BBE DBY JPS WBS YLT NAS)
Joshua 19:27 and it turned toward the sunrising to Beth-dagon, and reached to Zebulun, and to the valley of Iphtah-el northward to Beth-emek and Neiel; and it went out to Cabul on the left hand, (ASV BBE DBY JPS WBS YLT NAS RSV)