Assuming a population of 10,000 for each city, that would be 160,000 people.
This all happened on the day that Jesus died in the year 34 CE.
Fewer Words Version: And it came to pass that a voice was heard by every human on earth. 2-12 The voice said that bad things will happen to everyone on earth unless they repent; that he was the one that burned to death, drowned, and buried the inhabitants of Zarahelma, Moroni, and Moronihah. He sunk the cities of Gilgal, Gadiandi, Gadiomnah, Jacob, and Gimgimno; drowned the cities of Onihah, Mocum, and Jerusalem; and burned the great city of Jacobugath. He burned to death the inhabitants of Jaobugath because they were the worst people on earth, with their secret combinations and whatnot. He also burned the cities of Lamn, Josh, Gad, and Kishkumen because they cast out prophets and stoned the preachers who called them wicked. He burned, drowned, and buried the people of these sixteen cities because they were so darned wicked. And he'll do it to you too, if you don't' repent.(3 Nephi 9:1-12
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