So I've been on this kick about "domicile". I think what is going on when they ask for that information is they are trying to make presumptions about domicile. Name, date of birth, etc. leads to presuming residence which leads to presuming domicile. If domicile is within their jurisdiction, then one is under the rule of their statutes. In terms of a biblical stance, I have found people to declare domicile within the kingdom of heaven on earth, or even the ocean. That way, God's law is the only form of law that can be used in court when a judgement is being made. If domicile isn't specifically stated, it is presumed to reside within the area of the residence.
That's where I'm at with it right now at least.
Now back to more research...