Orvosmacko,

From the information I collected, the states that require all clerkships be done in ACGME "green book" hospitals only are:

DE, LO, MA, MI, MS, NH, NC, OK, PA

also, in addition to this, some states require that the hospital verify your clerkships in writing to them for licensing. These states are:
AL, AR, CN, NC

I am sure that I am missing some states, but this is from the states I went through.

One thing to keep in mind is that the states that require ACGME rotations require them not only for all CORE rotations, but for all ELECTIVES as well. So it isn't useful to do your core's in green book and your electives in community hospitals. Every site has to be a valid teaching site.