The island council was governing body of the island area, an administrative level of the Netherlands Antilles

Netherlands Antilles

The Netherlands Antilles , also referred to informally as the Dutch Antilles, was an autonomous Caribbean country within the Kingdom of the Netherlands, consisting of two groups of islands in the Lesser Antilles: Aruba, Bonaire and Curaçao , in Leeward Antilles just off the Venezuelan coast; and Sint...

 until its dissolution.

Island councils existed for:

• Aruba
  Aruba
  Aruba is a 33 km-long island of the Lesser Antilles in the southern Caribbean Sea, located 27 km north of the coast of Venezuela and 130 km east of Guajira Peninsula...
  
   (until its secession from the Netherlands Antilles in 1986)
• Bonaire
• Curaçao
  Curaçao
  Curaçao is an island in the southern Caribbean Sea, off the Venezuelan coast. The Country of Curaçao , which includes the main island plus the small, uninhabited island of Klein Curaçao , is a constituent country of the Kingdom of the Netherlands...
  
  
• Saba
• Sint Eustatius
• Sint Maarten

The latter three were until 1 April 1983 governed by a single island council

• the Windward Islands 

Dissolution of the Netherlands Antilles

Upon the dissolution of the Netherlands Antilles in 2010, the island councils of Sint Maarten and Curaçao

Curaçao

Curaçao is an island in the southern Caribbean Sea, off the Venezuelan coast. The Country of Curaçao , which includes the main island plus the small, uninhabited island of Klein Curaçao , is a constituent country of the Kingdom of the Netherlands...

 have become the estates of Sint Maarten

Estates of Sint Maarten

The Parliament of Sint Maarten consists of 15 members, each elected for a four year term in a general election. The first Parliament was installed on 10 October 2010, the date of the dissolution of the Netherlands Antilles, and consist of the members of the island council elected on 17 September...

 and the estates of Curaçao

Estates of Curaçao

The Estates of Curaçao consist of 21 members, each elected for a four year term in a general election. The first Estates were installed on 10 October 2010, the date of the dissolution of the Netherlands Antilles, and consist of the members of the island council elected on 27 August 2010.The...

 respectively. The island councils of Bonaire, Saba and Sint Eustatius (the Caribbean Netherlands), kept there name and became island councils of the special municipalities

Island council (Netherlands)

The island council is a form of local government in special municipalities in the Caribbean Netherlands. It is similar to municipal council in the European part of the Netherlands...

of the Netherlands.