Anguilla, Antigua and Barbuda, Argentina, Aruba, Bahamas, Barbados, Belize, Bermuda, Brazil, Canada (B) (P), Cayman Islands, Chile, Colombia, Costa Rica, Cuba, Dominica, Dominican Republic, Ecuador (NB), El Salvador, French Guiana, Grenada, Guadeloupe, Guatemala, Guyana, Haiti, Honduras, Jamaica (NB), Martinique, Mexico, Montserrat, Netherlands Antilles, Nicaragua, Panama, Peru, Puerto Rico, St Kitts and Nevis, St Lucia, St Pierre and Miquelon (P), St Vincent and The Grenadines, Suriname, Trinidad and Tobago, Turks and Caicos Islands, USA (B), Venezuela, Virgin Islands (British) (B) (NB), Virgin Islands (U.S.) (B) (NB).
Vagrant to Finland, France, Norway, Portugal, United States Minor Outlying Islands, Uruguay (NB).
Population
Estimated population is 250,000 (2010).
Willet (Tringa semipalmata) [XC780566]
by Skyler Bol from Whitewater Draw WA, near McNeal, Cochise Co, Arizona, United States (call)
Willet (Tringa semipalmata) [XC651134]
by Paul Driver from Delmarva Peninsula (near Chincoteague), Accomack County, Virginia, United States (call)
Subspecies
The following 2 subspecies are recognised:
inornata (Gmelin, 1789) - Central Alberta and south-western Manitoba south to northern Colorado and western Nebraska. Winters from coastal southern USA to northern South America, mainly on Pacific coast, south to northern Chile.
semipalmata (Gmelin, 1789) - Southern New Brunswick, Atlantic and Gulf coasts of USA, and West Indies. Winters from Atlantic and Gulf coasts of USA and Mexico through Central America and West Indies south to southern Brazil.