Anguilla, Antigua and Barbuda, Argentina, Bahamas, Barbados, Belize, Bermuda (B), Bolivia, Brazil, Canada (B), Cayman Islands, Colombia, Costa Rica, Cuba, Dominica, Dominican Republic, Ecuador, El Salvador, French Guiana, Guadeloupe, Guatemala, Guyana, Haiti, Honduras, Jamaica (B), Martinique, Mexico, Montserrat, Nicaragua, Panama, Paraguay, Peru, Puerto Rico, St Kitts and Nevis, St Lucia, St Vincent and The Grenadines, Suriname, Trinidad and Tobago, Turks and Caicos Islands, USA (B), Venezuela.
Vagrant to Iceland, Morocco, Portugal, St Pierre and Miquelon (P), Virgin Islands (British), Virgin Islands (U.S.).
Population
Estimated population is 130,000 (2010).
Least Bittern (Ixobrychus exilis) [XC140515]
by Paul Marvin from Viera Wetlands, Florida, United States (flight call)
Least Bittern (Ixobrychus exilis) [XC819259]
by JAYRSON ARAUJO DE OLIVEIRA from Projeto Formoso, BR-242, Formoso do Araguaia, Tocantins, Brazil (alarm call, call)