More than just Switzerland. From the Wikipedia euthanasia page:
Jurisdictions where euthanasia or assisted suicide is legal include the Netherlands, Belgium, Luxembourg, Switzerland, Estonia, Albania, the US states of Washington, Oregon and Montana, and, starting in 2015, the Canadian Province of Quebec.
Jurisdictions where euthanasia or assisted suicide is legal include the Netherlands, Belgium, Luxembourg, Switzerland, Estonia, Albania, the US states of Washington, Oregon and Montana, and, starting in 2015, the Canadian Province of Quebec.
http://en.wikipedia.org/wiki/Euthanasia