Aruba, Bahamas, Belize, Canada, Cayman Islands, Colombia, Costa Rica, Cuba, Dominican Republic, Ecuador, El Salvador, Guatemala, Guyana, Haiti, Honduras, Jamaica (B), Mexico, Netherlands Antilles, Nicaragua, Panama, Peru, Puerto Rico, Trinidad and Tobago, USA (B), Venezuela.
Vagrant to Barbados, Bermuda, Dominica, French Guiana, Turks and Caicos Islands, Virgin Islands (U.S.).
Baja California east to northern Carolina and south through Mexico, central America and Greater Antilles to Colombia, north-western Venezuela, western Ecuador and extreme north-western Peru.
 
Population
Estimated population is 150,000 (2010).
American White Ibis (Eudocimus albus) [XC578062]
by Simon Elliott from Wakodahatchee Wetlands, Palm Beach Co., Florida, United States (alarm call, call, hatchling or nestling)
American White Ibis (Eudocimus albus) [XC561172]
by Isain Contreras Rodr\u00edguez from Skidaway Island, Chatham County, GA USA, United States (call)
Subspecies
Forms superspecies with Scarlet Ibis (Eudocimus ruber). A recent proposal is that they be merged into a single species on basis of close morphological and ecological similiraties and relatively frequent natural hybridization in zone of overlap in Venezuela. Another view is that they may simply be color morphs.
The following 2 subspecies are recognised:
albus (Linnaeus, 1758) - Southern United States south through Central America and the Greater Antilles to north-western South America.
ramobustorum Patten, 2012 - Northern South America.