1. Spain: This is where Spanish originated, and it is the official language in the country.
2. Mexico: Spanish is the most spoken language in Mexico, with over 99% of the population speaking it.
3. Colombia: Spanish is the official language and spoken by virtually everyone in the country.
4. Argentina: Spanish is the official language of Argentina and is spoken by a large majority of the population.
5. Chile: Spanish is the official and most widely spoken language in Chile.