13,394 NPCs

Classic reference; current Forever availability is unconfirmed.

NPCLevelTitleZone
Brokespear17The Barrens
Dark Iron Geologist43–44Searing Gorge
Dark Iron Steamsmith46–47Searing Gorge
Rocklance17The Barrens
Takk the Leaper19The Barrens
Slave Worker45–47Searing Gorge
Dark Iron Slaver45–46Searing Gorge
Dark Iron Taskmaster47–48Searing Gorge
Heggin Stonewhisker24Bael'dun Chief EngineerThe Barrens
Malgin Barleybrew25Bael'dun Morale OfficerThe Barrens
Digger Flameforge24Excavation SpecialistThe Barrens
Blazing Elemental45–47Searing Gorge
Captain Gerogg Hammertoe27Bael'dun Captain of the GuardThe Barrens
Inferno Elemental47–49Searing Gorge
Tempered War Golem45–47Searing Gorge
Heavy War Golem47–49Searing Gorge
Magma Elemental46–48Searing Gorge
Glassweb Spider43–45Searing Gorge
Searing Lava Spider45–47Searing Gorge
Greater Lava Spider47–49Searing Gorge
Hagg Taurenbane26Razormane ChampionThe Barrens
Twilight Dark Shaman47–48Searing Gorge
Twilight Fire Guard48–49Searing Gorge
Twilight Geomancer49–50Searing Gorge
Geopriest Gukk'rok19The Barrens
Swinegart Spearhide22The Barrens
Dishu13The Barrens
Evil Squirrel1
Krond27ButcherStonetalon Mountains
Larhka18Beverage MerchantThe Barrens
Gan'rul Bloodeye40Orgrimmar
Thun'grim Firegaze29The Barrens
Un'Thuwa14Mage TrainerDurotar
Cursed Sycamore45Feralas
Pephredo60Mage TrainerOrgrimmar
Enyo50Mage TrainerOrgrimmar
Mai'ah10Mage TrainerDurotar
Deino40Mage TrainerOrgrimmar
Gwyn Farrow16Mushroom MerchantSilverpine Forest
Canaga Earthcaller8Durotar

Classic reference data from QuestieDB (Forever data, commit c5de61a), with positions on Forever's zone maps. It doesn't confirm that an NPC, location, quest or item is in Forever.