1. Netherlands (also known as Holland)
2. Belgium (the Flemish region)
3. Suriname
While Dutch is also spoken in some other countries, it's not an official language there, such as in:
* South Africa (Afrikaans is a derivative of Dutch)
* Indonesia (Dutch was the language of administration during colonial times)
* Caribbean Netherlands (Bonaire, Sint Eustatius, Saba)
So, if we are talking about countries where Dutch is an official language, the answer is three.