It's a complicated question, and most online resources are wrong. Or at least, get details wrong and provide incorrect summaries. ConcealedCarry.com
each have pages on this, and if you look at their maps you'd think almost all states require notification.
The problem is their summaries don't match their own information. If you go to http://concealednation.org/2015/07/do-y ... e-answers/
and scroll past the map, you'll see that almost all states marked as having a duty to notify If Asked, actually read like this: If Asked
(No known duty to inform law enforcement)
So is that a duty to notify or isn't it? Clicking to their longer description for Alabama (for instance), it starts with this: Alabama – No Duty To Inform
and througout the whole section it's pretty clear they were unable to find a legal requirement to inform law enforcement of the fact that you are licensed to have a gun and that you do. Likewise Florida is marked as a duty to inform if asked state, but the truth is that you only have to show your license if the officer asks for it. You have no obligation to volunteer that you are licensed, even when asked for ID, unless to document your legal authority to have your firearm on/with you when that specific question comes up.
There are 2 states identified as never having a duty to inform,but there are also another 27 states where, despite the fact that their map shows yellow as Yes a Duty to Inform If Asked, the summary for those states reads: "no known duty" to inform law enforcement. TL;DR
If we ignore their incorrect maps and go by the longer text descriptions, there are 29 no duty to inform states