Bahamas, Belize, Bermuda, Canada (B) (P), Cayman Islands, Costa Rica, Cuba, Dominican Republic, El Salvador, Guatemala, Haiti, Honduras, Mexico, Nicaragua, Panama, Puerto Rico, St Pierre and Miquelon (P), Turks and Caicos Islands, USA (B).
Vagrant to Jamaica.
Southern Canada (central Alberta east to Nova Scotia) and central and eastern USA (North Dakota east to Maine, and south to southern Texas and Florida. Winters from central Mexico to western Panama, and also in southern Florida (USA)
 
Population
Estimated population is 7,000,000 (2010).
Ruby-throated Hummingbird (Archilochus colubris) [XC179809]
by Aidan Place from Sandyston, Sussex County, New Jersey, United States (call)
Ruby-throated Hummingbird (Archilochus colubris) [XC17065]
by Mike Nelson from Michigan, Waterloo SRA, United States (call, calls, wing sounds)
Subspecies
Genus sometimes merged into Mellisuga. Alternatively linked with Selasphorus. On occasion, considered to form a superspecies with Black-chinned Hummingbird (Archilochus alexandri) and some authors would also include Costa's Hummingbird (Calypte costae).