There was only 1 just man in all of Sodom and Gomorrah (LOT) and he was delivered....the rest were lost and yes they are still burning and suffering the vengeance of eternal fire.....
By the time Lot reached Zoar, the sun had risen over the land. Then the Lord rained down burning sulfur on Sodom and Gomorrah—from the Lord out of the heavens. Thus he overthrew those cities and the entire plain, destroying all those living in the cities—and also the vegetation in the land.
Those in the cities were destroyed according to Scripture (Gen 19:23-25 given above). A few verses later it again says, God destroyed the cities of the valley. Today they are no longer burning. Word 7843, destroy, is used multiple times in relation to the cities, meaning to ruin completely, devastate, etc:
http://biblehub.com/hebrew/leshachatah_7843.htm
Genesis 19:13
HEB: וַיְשַׁלְּחֵ֥נוּ יְהוָ֖ה לְשַׁחֲתָֽהּ׃
NAS: has sent us to destroy it.
KJV: hath sent us to destroy it.
INT: has sent the LORD to destroy
Judges 6:5
HEB: וַיָּבֹ֥אוּ בָאָ֖רֶץ לְשַׁחֲתָֽהּ׃
NAS: into the land to devastate it.
KJV: into the land to destroy it.
INT: came the land to devastate
2 Samuel 24:16
HEB: הַמַּלְאָ֥ךְ ׀ יְרֽוּשָׁלִַם֮ לְשַׁחֲתָהּ֒ וַיִּנָּ֤חֶם יְהוָה֙
NAS: toward Jerusalem to destroy it, the LORD
KJV: upon Jerusalem to destroy it, the LORD
INT: the angel Jerusalem to destroy relented the LORD