the code as said above can be found in some of those locations but not always. originally your car should have came with a card with the code on it, but if you bought the car used you probably don't have it.
What Younglemon is describing is how to get the serial for the radio, and since that serial is associated with your car, then when you give honda that and your vin they can verify that it is yours and give you the code
i took mine to honda and they did it for free, but sometimes i heard of ppl being charged 100 dollars cuz they had to pull out the radio.
anyway there have been threads on this so use the search tool