Heatherfield is the home town of the W.I.T.C.H.
girls. It's a fairly big city (Approx. 500 000 inhabitants), but very unusual in the sense
that it contains several portals
to parallel dimensions
. I.e. the house of Eylon
, which contain a portal to the dimension of Meridian
Heatherfield is a very international citym with large cooperations like Simultech and others. Not to mention all the people of different ethnic backgrounds. Hay Lin is of chineese descent, Taranee has African background and so on.
It is not clear where Heatherfield is located, but a good guess would be somewhere in California.