My personal view or headcanon was
Prime World: (Includes nearly all King's Earth set works - even if there are some contradictions I'd still consider the same exact world. A couple inconsistencies doesn't automatically make it a parallel Earth. i'd just chalk that up to mistakes here and there.)
The prime world includes IT, Salem's Lot, Shining, Dead Zone, Needful Things and so on. Almost anything set in Castle Rock and Derry. The stuff with the really obvious connections.
Keystone Earth: (The Earth Eddie, Jake, and Sussanah hail from. Mr. Mercedes can also take place here, possibly.)
The Stand world - possibly two version of them
Mid World - (Obviously - much of the DT series and Eyes of the Dragon)
The Territories
And there are several others, but this just sort of my headcanon.
Prime World: (Includes nearly all King's Earth set works - even if there are some contradictions I'd still consider the same exact world. A couple inconsistencies doesn't automatically make it a parallel Earth. i'd just chalk that up to mistakes here and there.)
The prime world includes IT, Salem's Lot, Shining, Dead Zone, Needful Things and so on. Almost anything set in Castle Rock and Derry. The stuff with the really obvious connections.
Keystone Earth: (The Earth Eddie, Jake, and Sussanah hail from. Mr. Mercedes can also take place here, possibly.)
The Stand world - possibly two version of them
Mid World - (Obviously - much of the DT series and Eyes of the Dragon)
The Territories
And there are several others, but this just sort of my headcanon.