North America:
* Mexico
* United States (official language in Puerto Rico)
Central America:
* Belize (while English is the official language, Spanish is widely spoken)
* Costa Rica
* El Salvador
* Guatemala
* Honduras
* Nicaragua
* Panama
South America:
* Argentina
* Bolivia
* Chile
* Colombia
* Ecuador
* Paraguay
* Peru
* Uruguay
* Venezuela
Caribbean:
* Cuba
* Dominican Republic
Europe:
* Spain (also official language in Andorra)
Africa:
* Equatorial Guinea
Other:
* Western Sahara (Spanish is the main language, though disputed territory)
Note: There are also many countries where Spanish is spoken by significant minorities, including the Philippines, the United States, and parts of Africa.