One of the stronger arguments used by Jerusalem proponents involves the identification of the phrase the great city as used in Revelation Rev. 17:18+. Jerusalem advocates contend that the only way to properly identify this city is to observe how the phrase the great city appears earlier in Revelation. There are only two references to the great city prior to Revelation Rev. 17:18+. These references include Revelation Rev. 11:8+ and Revelation Rev. 16:19+. Jerusalem advocates believe that both are unmistakable references to Jerusalem. Thus, Revelation Rev. 17:18+ must refer to Jerusalem as well.1
1 Andy Woods, What is the Identity of Babylon In Revelation 17-18?.