11 Grimmauld Place is a Muggle household on Grimmauld Place, in London. Since number twelve is magically hidden from most people, this house's residents have accepted the "amusing mistake in the numbering that had caused number eleven to sit beside number thirteen". When Harry Potter first visited Grimmauld Place in 1995, this house had a stereo thudding in an upstairs room and a pile of bin-bags outside its front gate.