Not necessarily. Countries without formal treaties can still cooperate on a case-by-case basis or use other legal mechanisms to return individuals. With that said, the US has extradition treaties with around 100 countries. Considering that there are almost 200 nations in the world, this leaves you with a whole list https://210list.com/story19080169/a-proposito-di-fatti-locate-english-speaking-lawyer-italy-revealed