Anguilla, Antigua and Barbuda, Argentina, Aruba, Bahamas, Barbados, Belize, Bolivia, Brazil, Cayman Islands, Colombia, Costa Rica, Cuba, Dominica, Dominican Republic, Ecuador, El Salvador, French Guiana, Guadeloupe, Guatemala, Guyana, Haiti, Honduras, Jamaica (B), Martinique, Mexico, Montserrat, Netherlands Antilles, Nicaragua (B), Panama, Paraguay, Peru, Puerto Rico, St Kitts and Nevis, St Lucia, St Vincent and The Grenadines, Suriname, Trinidad and Tobago, Turks and Caicos Islands, Uruguay (B), USA (B), Venezuela.
Vagrant to Virgin Islands (U.S.).
West Indies and Mexico south to north-western Peru and east of Andes to north-eastern Argentina.
 
Population
Estimated population is 50,000 - 499,999 (2010).
Masked Duck (Nomonyx dominicus) [XC48341]
by Marco Cruz from Establecimiento Uaranina, Ruta 69, San Javier, Santa Fe, Argentina (song)
Masked Duck (Nomonyx dominicus) [XC513795]
by JAYRSON ARAUJO DE OLIVEIRA from Agronomia UFGO - Rio Meia Ponte\/C\u00f3rrego Samambaia., Brazil (alarm call)