“Isn’t there also a harlot?”
The harlot is not a person though, the harlot is a city (and perhaps by extension the things associated with that city):
“And the woman which thou sawest is that great city, which reigneth over the kings of the earth.” Rev. 17:18
Compare with Isaiah 1:21:
“How is the faithful city become an harlot! it was full of judgment; righteousness lodged in it; but now murderers.”
This is speaking of, as it says at the beginning of the chapter, “concerning Judah and Jerusalem in the days of Uzziah, Jotham, Ahaz, and Hezekiah, kings of Judah.”
So the harlot there is Jerusalem, but perhaps by extension representing the people and kings of Judah.