Washington DC is that great city that rules over the whole earth -- King Dollar.
I will explain this, I wrote a blog on this 10 years back, you cited on verse on page 2 that gives us the answer to who Babylon the Great is out of God's own mouth to John the Revelator in Revvvv. 16:19.
Revv. 16:19 And the
great city(Jerusalem) was
divided into three parts(Earthquake/2nd Coming), and the
cities of the nations fell(Jesus defeats the Nations/City States at Armageddon): and
great Babylon came in remembrance before God, to give unto her the cup of the wine of the fierceness of his wrath.
So, God Himself says those Jesus defeats at Armageddon are Babylon the Great, thus all we have to do is figure out who they are, guess what Vial #6 tells us who God is speaking about in Vial #7.
Revv. 16:14 For they are the spirits of devils, working miracles, which go forth unto the
kings of the earth and of the whole world, to
gather them to the battle of that great day of God Almighty.
God sees the WHOLE WORLD as Babylon the Great but why? Because it is Satan's Dark Kingdom of Deception over Mankind !! Babel = Confusion, and what and apt description of human beings, so confused they try to fight their own loving Creator. Thus when Satan falls, Babylon the Great will fall.
Now, I cam go over why Babylon is used, it became a name used in place of Rome, the world Greece etc. etc. because using Rome or the whole world would have been seen as the Romans as sedition by the church and they would have confiscated the letters of Revelation, and killed them for saying Rome/World was going to be judged, so God used Babylon, when the Romans saw that the laughed. these goofy Christians do not even know Babylon is a Dead City. Likewise God used the Women (Revv. 12) and the 144,000 (Rev. 7 & 14) both for Israel/Jerusalem who Rome had destroyed in 70 AD.
Babylon in Rev. 17 is used as 1 of 3 Descriptors, nothing else, its used to describe who the Harlot is. It was never MYSTERY Babylon, it was MYSTERY.......then 1.) Babylon, 2.) Mother of Harlots and 3.) Abominations.
MYSTERY ( as in a question mark)
1.) Babylon the Great (Babylon was world renowned for its
FALSE RELIGION)
2.) Mother of Harlots (
FALSE RELIGION was the original Harlotry against God)
3.) Abominations of the Earth (God hates all
FALSE RELIGION, he is a Jealous God)
This gives us the ANSWER to who the Harlot is, she is ALL FALSE RELIGION over all time on earth. The Harlot [False Religions] rides the back of the [Government] Beasts in Rev. 17:7. They were comingled. But the last Beast and his 10 Kings (Complete E.U. Reunited) kills off the Harlot, but why? Because the last Beast thinks he is god and demands all men worship him as GOD, there is no place in his kingdom for Islam, Hinduism, Buddhism, Jupiter, Zeus or any god.
Now we can move on to Revelationnn 18 which describes the WHOLE WORLD getting pelted with God's plagues over a 1260 day period of time.
In vs. 2 we see Babylon (world) has become a Habitation of Devils/Demons. Well of course it has, Satan was cast down to earth and Apollyon and his demons released from the Bottomless Pit. In vss. 4 we see God telling Israel to come out of her (Babylon/World) lest she receives of her plagues. So, this is Israel (the 1/3 who repents at least) fleeing Judea into the Petra/Bozrah mountains.
In verses 8 & 10 we get two huge clues also. Babylon will fall in ONE HOUR and in ONE DAY. Well, both mean 1260 days, how so? Read Rev. 17:12, the 10 Kings rule ONE HOUR with the Beast who we know rules for 1260 days and the Day of the Lord (God's Wrath) we know lasts for exactly 1260 days.
The rest o the chapter is just PROSE, describing Satan's Dark Kingdom on earth, ruled by Greed & Lust, getting Judged by God. He just uses a one city reference, but of course its the whole world being judged.