Parmandur
Book-Friend, he/him
Yeah, that Wiki page is a mess, due to all the chaos and changes to Calomport through the editions. Waterdeep and Baldur's Gate have actually weathered the Whiakey Tango Foxtrot of the 15h century Dale Reckoning and prospered, but Calimport got megascrewed: the population in 1373 was about 200,000, but was down to 60,000 in 1479 (3E to 4E books).I think @pukunui is right that Waterdeep is bigger than Baldurs Gate, but if memory serves me correct I believe the distinction of biggest city (both size and population) in Faerun goes to Calimport, at least as it was described in the 2E Empires of the Shining Sea boxed set and the Calimport source book, but that was three editions ago so that may have changed by now. Waterdeep is definitely the biggest in the North/Sword Coast region.
EDIT: According to FR Wiki
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Calimport
Calimport was the sprawling capital city of the country of Calimshan.[3][2][20] For most of its existence, it was by far the largest city in all of Faerûn.[7] It was the long-time home of the assassin Artemis Entreri, known for his longstanding feud with Drizzt Do'Urden.[21] Calimport was...forgottenrealms.fandom.com
The metropolis was a huge place, measuring almost six miles from east to west and three miles from the coastline to the northern border.[1]
Heres the refernce
Steven E. Schend (October 1998). Calimport. (TSR, Inc), p. 4. ISBN 0-7869-1238-3.
Then, in the 80's, the entire government of Calimshan gets overthrown in a religious slave revolution whem they kicked the Genies off the Material Plane, so it's probavly dropped further in the war and chaos. Baldur's Gate might be the bigger city by this point.