At first,thanks for this new forum 
Now here's my list of countries or territories, that seem to be impossible...
1.) Antarctica
Is there a way to get that falg? I don't know...
2.) Bouvet Island
Population: uninhabited....hmmm...
3.) Cocos (Keeling) Islands
Population: 596...very hard i would say 
4.) South Georgia and the South Sandwich Islands
any population there?
5.) Heard Island and McDonald Islands
Population: uninhabited 
6.) North Korea
Population: 23,479,088...but...is there any Internet in North Korea? I never seen a FlagCounter with a North Korea Flag....
7.) Norfolk Island
2150 Inhabitants, really hard to solve
8.) Pitcairn Islands
Population: 48....anybody know someone from these Islands ? Thank you 
9.) Svalbard
Population: 2,165...possible, I think...maybe with patience 
10.) French Southern and Antarctic Lands
No idea,how to get that 


11.) Tokelau
Population: 1,433....hard...
12.) Holy See (Vatican City)
possible, the Official FlagCounter has 3 Visits from the Holy See....very difficult 
If somebody got one of these flags,respect !