66% of Americans own their home. I would expect more people have a 401k than that. But it also depends how you count non-working adults, who might own a home bu

66% of Americans own their home. I would expect more people have a 401k than that. But it also depends how you count non-working adults, who might own a home but not have a 401k (although then their partner's 401k may be considered theirs in part, perhaps).