Inaccessible is more common, but it seems that unaccessible is sometime used in the same places and it is listed in some online dictionaries.

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    Could you add the dictionary references you have found? Aug 5 '19 at 13:28
  • Purely a personal opinion, but to the extent that unaccessible could reasonably be used at all (and I might just spell it unaccessable anyway), I'd restrict it to IT-oriented data retrieval. That's to say, information you can't access, rather than the more common sense of place you can't get to. Aug 5 '19 at 13:46
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    Are you asking why some words are less common than others? I don't think anybody can answer that. Aug 5 '19 at 15:02
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    The other day I was discussing "accessible" with another editor and noted that "handicapped-accessible" is often clipped to "accessible," and I asked whether people 50 or 100 years from now will read that and wonder what an accessible rest room was vs. an inaccessible one.
    – Literalman
    Aug 5 '19 at 17:21
  • Context is everything! The word choice may seem obvious from a logical reasoning standpoint. Inaccessible can imply that the object is difficult or next to impossible for anyone to access such as the deepest depth of the ocean called Challenger Deep. A way to look at inaccessible as closed off to public. It is not impossible or too difficult for authorized persons to get access to the same place such a a live crime scene that is taped off. Only special people can get in. If you are not special or authorized you have no access to that place. I would say there is a noticeable difference.
    – Logikal
    Aug 6 '19 at 14:35

Though listed in some dictionaries, unaccessible appears to be just an uncommon variant of inaccessible as suggested by Google Books .

Note that:

Un- is the most prolific of English prefixes, freely and widely used in Old English, where it forms more than 1,000 compounds. It underwent a mass extinction in early Middle English, but emerged with renewed vigor 16c. to form compounds with native and imported words. It disputes with Latin-derived cognate in- the right to form the negation of certain words (indigestable/undigestable, etc.), and though both might be deployed in cooperation to indicate shades of meaning (unfamous/infamous), typically they are not.


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