19. Is North Korea mentioned in Bible prophecy?

The very short answer:
Maybe, with qualifications.

Is the word "Korea" in the Bible? : Most definitely not! Not explicitly, and not even implicitly.

Ten years ago, no one would even consider that North Korea might be a factor in the last days. But answer this: Is the word "China" mentioned in the Bible? Most definitely not! But most authors of books on prophecy consider that the nation of China -- more specifically the army of China -- appears near the final days of the end times.

It can be seen in the following passage in Revelation 9:13-16 which says:
13 Then the sixth angel blew his trumpet: And I heard a voice from the four horns of the golden altar which is before God, 14 saying to the sixth angel who had the trumpet, “Release the four angels who are bound at the great river Euphrates.” 15 So the four angels, who had been prepared for the hour, the day, the month, and the year, were released to kill a third of mankind. 16 Now the number of the army of the horsemen was two hundred million; I heard their number.

Another passage in Revelation 16:12 speaks of what most consider to be the same event and time: 12 Then the sixth angel poured out his bowl on the great river Euphrates, and its water was dried up, so that the way of the kings from the east might be prepared.

This number of people (if the figure is to be taken literally) has been possible only since perhaps 1970, and almost all writers take this to be the Chinese army. However, there are other possibilities. The Revelation 9 passage does not tell where they are coming from, but the Revelation 16 passage says they are "the kings from the east". East often means "Orient", and the Orient includes such nations as China, Japan, and Korea. So this could be an all-out assault from the Orient countries.

Another view, which might exclude Korea, is that the Muslim nations also are generally to the east of the Holy Land, which is where all the nations are heading at the time of these two passages. This could be an all-out assault from the Muslim countries.

So the evidence is inconclusive and not as easy to interpret compared to whether Iran is mentioned in Bible prophecy, but thought-provoking just the same. For sure, we'll be looking at this issue again.