While you can find unoffical street view coverage or at least photosphers from every single country in the world not every single country has offical coverage.
Countries with offical coverage are the following:
The countries marked in red are countries you will see all the time in Geoguessr and it is a safe bet to guess in one of them.
The countries marked in pink are quite rare and mostly trekker locations. I would suggest not guessing them unless there is a good hint it might be one of those countries.
The countries marked in blue you will almost never see unless you are playing a specific map that includes them. Don't guess these countries unless there is a good hint it might be one of those countries.
The countries marked in gray don't have official coverage and they should not be guessed unless the map includes unofficial coverage.
Coming soon
We will soon beging to compile and prepare pages which will showcase the information and meta about each country separately. They will be accessible from here as they get published.
Africa:
Botswana
Eswatini
Ghana
Kenya
Lesotho
Madagascar
Nigeria
Rwanda
Senegal
South Africa
Tunisia
Uganda
Asia:
Bangladesh
Bhutan
Cambodia
Christmas Island
India
Indonesia
Israel
Japan
Jordan
Kyrgyzstan
Laos
Malaysia
Mongolia
Philippines
Russia
Singapore
South Korea
Sri Lanka
Taiwan
Thailand
United Arab Emirates
Vietnam
Europe:
Albania
Andorra
Austria
Belgium
Bulgaria
Croatia
Czech Republic
Denmark
Estonia
Faroe Islands
Finland
France
Germany
Gibraltar
Greece
Hungary
Iceland
Ireland
Isle of Man
Italy
Jersey
Latvia
Lithuania
Luxembourg
Malta
Monaco
Montenegro
Netherlands
North Macedonia
Norway
Poland
Portugal
Romania
San Marino
Serbia
Slovakia
Slovenia
Spain
Sweden
Switzerland
Turkey
Ukraine
United Kingdom
North America:
Canada
Curaçao
Dominican Republic
Greenland
Guatemala
Mexico
Puerto Rico
United States
US Virgin Islands
Oceania:
American Samoa
Australia
Guam
New Zealand
Northern Mariana Islands
South America:
Argentina
Bolivia
Brazil
Chile
Colombia
Ecuador
Peru
Uruguay