In which country is Dutch not an official language?

Dutch is a West Germanic language spoken by around 24 million people as a first language and 5 million people as a second language, constituting the majority of people in the Netherlands (where it is the sole official language countrywide) and Belgium (as one of three official languages). It is the third-most-widely spoken Germanic language, after its close relatives English and German.

Dutch is an official language of the Netherlands proper, Belgium, Suriname, the Dutch Caribbean municipal (St. Eustatius Saba & Bonaire), Aruba, Curaçao and Sint Maarten. Dutch is also an official language of several international organisations, such as the European Union, Union of South American Nations and the Caribbean Community. At an academic level, Dutch is taught in about 175 universities in 40 countries. About 15,000 students worldwide study Dutch at university.