And this Wikipedia page for Enontekio suggests 6565 feet. I suspect someone in Finland created it (may be the airport) so it is more likely to be accurate. Even though one cannot rely on a Wikipedia page not being sabotaged.
See
Enontekiö Airport - Wikipedia, the free encyclopedia
Presumably it was extended to take advantage of the Santa trip opportunities as the suggested annual passenger numbers must surely be now many times higher than those given on the Wikipedia page.
Have any aircraft ever been stranded there for several days during a bad storm or whatever.