Maine currently uses an amended version of the 2015 IRC building code, which includes a section about wood decks (R507). There are other sections that may be relevant depending on the specifics, e.g. Egress (R311) and Fall Protection (R312). Your local city/town may have additional requirements related to decks (most commonly relating to setbacks but really could be anything).

Note that building codes are not instruction manuals for construction... you have to follow the code but if you are inexperienced it will not be much help. Sort of like reading traffic laws won't really teach you how to drive a car.