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[Lurks Often]

58. But that isn't what the poster I responded to said

His post, intentionally or otherwise, implied that NK would strike the United States with enough nuclear weapons to kill a majority of the US population.

As to your answer, while certainly far too many people will die, the actual number would depend on how many nuclear weapons NK could deliver before the US (and maybe South Korea) destroyed all the launch sites, fixed or mobile.

Preparations for a large scale nuclear attack by NK would be pickedup by satellite, which would be a legitimate reason for a pre-emptive strike by the US, which would almost certainly consist of a large number of cruise missiles (about 150) from whichever SSGN is near North Korea: https://en.wikipedia.org/wiki/Ohio-class_submarine#SSBN/SSGN_conversions
as well as B-2 strikes with precision guided weapons (up to 80 per plane) to take out launch sites, mobile launchers, command and control sites and air defense sites.