There could be millions of flags belonging to cities, states, countries, etc. in North America, there is no exact number.
70%-80% of the population, or 370,104,412 to 422,976,470 people.
More than six million due the huge numbers from Canada and Alaska.
if you mean languages, there are people from every part of the world with their own language and culture, so there are hundreds
About 15,000