Some numerical data on server population and faction balance (US PVE & RP servers)
New realms and updated population caps may change the Classic realm you choose to play on
Season of Mastery: Which Server to Choose? - News - Icy Veins
Server Population - Why don't we organise a massive movement to flesh out the other servers? We just need to do this a community. We don't need Blizzard. : r/classicwow
WoW Classic & WoW Classic WotLK Server Population
NEWS ‼️ "A few minutes ago, we... - WoW Classic News | Facebook