I've heard mixed information about whether McDonald's fries are vegan, and then I've heard that it can vary based on which country you're in. So is there a short list of countries where McDonald's fries are vegan?
Any list of countries to answer this question has the potential to suddenly become incorrect if any Country's McDonald's change their recipe, so I don't think it's a good idea to compile a list here. Instead, you should ask your server, or find the information on the relevant regional McDonald's website.
For reference, here are links various countries McDonald's statements about fries:
These are the 8 countries with the most McDonalds locations as listed here