Official language

An official language is a language that is given a special legal status in a particular country, state, or other jurisdiction. Typically a country's official language refers to the language used within government (e.g., courts, parliament, administration). Since "the means of expression of a people cannot be changed by any law", the term "official language" does not typically refer to the language used by a people or country, but by its government.
Worldwide, 178 countries have at least one official language, and 101 of these countries recognise more than one language. Many of the world's constitutions mention one or more official and/or national languages. Some countries use the official language designation to empower indigenous groups by giving them access to the government in their native languages. In countries that do not formally designate an official language, a de facto national language usually evolves. English is the most common official language, with recognized status in 51 countries. French, and Spanish are also widely recognized.
Nation by Official Language: 
Cantonese
* Kowloonesia
* Sunton
Dutch
* Brandholmer Republic
English:
*Austenasia
*Brandholmer Republic
*Koryeo
*Kowloonesia
*Naminara Republic
*Shiwan
*Sunton
*Templar Kingdom
*Woodland
Esperanto
* Brandholmer Republic
French:
*Templar Kingdom
Finnish
* Brandholmer Republic
Hangul
* Koryeo
Korean
* Naminara Republic
Mandarin
* Shiwan
Spanish:
*Templar Kingdom
Swedish
* Brandholmer Republic
Tagalog
* Kowloonesia