Anguilla, Antigua and Barbuda, Aruba, Bahamas, Barbados, Belize, Bermuda, Canada (B) (P), Cayman Islands, Colombia, Costa Rica, Cuba, Dominica, Dominican Republic, El Salvador, Guadeloupe, Guatemala, Haiti, Honduras, Jamaica (NB), Martinique, Mexico, Montserrat, Netherlands Antilles, Nicaragua, Panama, Puerto Rico, St Kitts and Nevis, St Lucia, St Pierre and Miquelon (B) (P), St Vincent and The Grenadines, Trinidad and Tobago, Turks and Caicos Islands, USA (B), Venezuela, Virgin Islands (British) (NB), Virgin Islands (U.S.) (NB).
Vagrant to Greenland, Iceland (B), Ireland (B), Netherlands, Portugal, Russia (Asian), Spain, United Kingdom.
Population
Estimated population is 130,000,000 (2010).
Myrtle Warbler (Setophaga coronata) [XC388416]
by Peter Boesman from Cut Bank, Glacier County, Montana, United States (call)
Myrtle Warbler (Setophaga coronata) [XC551319]
by Christopher McPherson from Goulds, Newfoundland and Labrador, United States (song)
Subspecies
Nominate subspecies has hybridized with Pine Warbler (Setophaga pinus). There is one record of hybridization (by subspecies auduboni) with Grace's Warbler (Setophaga graciae). Subspecies form two groups, formerly considered separate species, the northern "Myrtle group" (nominate subspecies and hooveri) and the western "Audubon's group" (auduboni, nigrifrons and goldmani). Southern sedentary subspecies nigrifrons and goldmani are isolated from northern migratory ones, and are now thought possibly to be sister-taxa that separated from northern groups in the Pleistocene (northern groups separating in the Holocene and still interbreeding in a narrow zone of overlap). The two southern resident taxa are, therefore, differentiated to the extent that they may represent two separate species, distinct from northern migratory forms. Subspecies hooveri weakly differentiated, and sometimes subsumed in nominate, from which differences largely clinal.
Proposed subspecies memorabilis (described from Boulder County, in Colorado), considered indistinguishable from auduboni.
The following 5 subspecies are recognised:
hooveri (McGregor, 1899) - Breeds in Alaska and north-western Canada (Yukon, central and southern Northwest Territories and northern British Columbia); migrates mainly to western USA and Middle America.
coronata (Linnaeus, 1766) - Breeds in southern Canada (from north-central Alberta east to Newfoundland and Nova Scotia) and north-eastern USA (Minnesota and Wisconsin east to New England); migrates mainly to south-eastern USA, eastern Middle America and Caribbean, also Bermuda.
auduboni (J. K. Townsend, 1837) - Breeds western North America from central British Columbia, western Alberta and Montana southern in mountains to extreme north-western Mexico (northern Baja California) and southern USA (western Texas). Winters mainly in south-western USA and Mexico (locally also south to Honduras). Considered by some authors to be a distinct species, Audubon's Warbler (Setophaga auduboni).
nigrifrons Brewster, 1889 - Western Mexico (Chihuahua and Durango). Considered by some authors to be a subspecies of Audubon's Warbler (Setophaga auduboni).
goldmani Nelson, 1897 - Central Guatemala; possibly also southern Mexico (south-eastern Chiapas).
BirdLife International Species Factsheet