We don't have ownership rates for legal guns in all states either
so how do you know how many guns are in each state?
Yes we do.
no we don't since not all guns are registered
Gun Ownership Statistics by State - Demographic Data
That was done by a survey not an actual count
You have counted and can say they are not accurate?
No one has asked me how many guns I have, none are registered, many were purchased before paperwork was even required, so no, the counts aren't accurate. BTW if someone were to ask I'd tell them it's none of their business.