Albania 5
Argentina 6
Armenia 4
Australia 7
Austria 8
Belarus 6
Belgium 3
Bolivia 5
Bosnia and Herzegovina 5
Brazil 6
Bulgaria 6
Canada 13
Chile 5
China 29
Colombia 6 (Columbia in the question, aka another question with mistakes...)
Croatia 7
Cuba 3
Cyprus 2
Czech Republic 3
Denmark 5
Egypt 6
Estonia 5
Finland 6
France 22
Georgia 5
Germany 13
Greece 10
Hungary 7
India 17
Indonesia 7
Iran 12
Ireland 6
Israel 5
Italy 20
Japan 8
Latvia 4
Lithuania 5
Malaysia 3
Mexico 8
Montenegro 3
Netherlands 4
New Zealand 4
Nigeria 6
North Korea 6
Norway 6
Pakistan 4
Paraguay 4
Peru 7
Philippines 4
Poland 6
Portugal 7
Republic of China (Taiwan) 4
Republic of Macedonia (FYROM) 5
Republic of Moldova 4
Romania 9
Russia 12
Saudi Arabia 13
Serbia 8
Singapore 1
Slovakia 4
Slovenia 6
South Africa 9
South Korea 9
Spain 17
Sweden 8
Switzerland 4
Thailand 5
Turkey 7
Ukraine 13
United Arab Emirates 7
United Kingdom 12
Uruguay 4
United States of America 51
Venezuela 8
Afghanistan 4
Morocco 6

Data obtained through the eRevollution APIs:  https://www.erevollution.com/en/article/34427

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Some observations regarding RL regions vs original core regions:

For France, until 2015 the nation had the same regions as in erevollution:



Since 2016, France has a smaller number of regions:



Source: https://en.wikipedia.org/wiki/Administrative_divisions_of_France

Brazil, on other hand, has only 6 ingame regions since the other game, 4 of them corresponding to the 5 ``big`` regions:



And the South region (the smallest one in RL) was divided in 2 regions: the two states of Paraná and Santa Catarina in one, and Rio Grande do Sul alone in the other

Albania has 12 regions (counties) in RL, divided into 61 municipalities, but only 5 in game: https://en.wikipedia.org/wiki/Administrative_divisions_of_Albania

Even in the unofficial divisions of Albania we do not have 5 regions (usually 4 or 3): https://en.wikipedia.org/wiki/Regions_of_Albania



So the RL regions did not correspond to ingame regions in all cases...