Creole languages are uncommon by the conditions of their formation, which place them outside the usual genetic classification of languages. While the majority of languages stem from a constant transmission from one generation to another, each transmission implying more or less significant changes, Creole languages appear to stem both from a rupture (an entire population forced to give up on their native language) and an encounter (with a new language, consequently deeply transformed).

More on Creoles

Portuguese-based Creoles

Africa

Guinea-Bissau Creole (Kriolu)                 160 000 speakers according to the SIL

Casamance Creole (Kriyol, Lingu Kristoŋ)  50 000 according to Chataigner

Cape Verdean Creole (Kabuverdianu)    920 000 according to the SIL

Angolar (N’gola)                                          5 000 according to the SIL

Annobonense (Fa d’Ambu) 2 500 according to the SIL

Forro 70 000 according to the SIL

Lunguyê 200 according to the SIL

America

Papiamentu (possibly Spanish-based)   319 000 according to Linguamundi

Note: The question of whether Papiamentu is Spanish or Portuguese-based is yet to be settled.

Cafundo 40 according to the SIL

Asia

Indo-Portuguese 4 900 according to Linguamundi

Macaense (Macau Creole) 4 000 according to the SIL

Sources

Linguamundi