Anguilla, Antigua and Barbuda, Aruba, Bahamas, Barbados, Belize, Bermuda, Brazil, Canada (B) (NB) (P), Cayman Islands, Colombia, Costa Rica, Cuba, Dominica, Dominican Republic, Ecuador, El Salvador, Guadeloupe, Guatemala, Haiti, Honduras, Martinique, Mexico, Montserrat, Netherlands Antilles, 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 Austria, Belgium, Bulgaria, Denmark, Faroe Islands, France, Germany, Gibraltar, Greenland, Hungary, Iceland, Ireland, Jamaica, Kiribati, Morocco, Netherlands, Norway, Poland, Portugal, Senegal, South Africa (B), Spain, Svalbard and Jan Mayen Islands, Sweden, Switzerland, United Kingdom.
Northern California, eastern Washington and interior British Columbia across prairie provinces and northern mountain and plains states; Great Lakes to Maritime Provinces. Winters in southern portion of breeding range south to Gulf Coast, Central America and Greater Antilles, increasingly ranging to Lesser Antilles.
 
Rarity Status
Currently this species is not classified as a rarity in this country OR information has not been updated.
Population
Estimated population is 2,600,000 (2010).
Ring-billed Gull (Larus delawarensis) [XC777534]
by Denis Provencher from Anse de Kerhuon (near Le Relecq-Kerhuon), Finist\u00e8re, Bretagne, France (call, flight call)
Ring-billed Gull (Larus delawarensis) [XC756253]
by Philippe J. DUBOIS from Dundalk, Louth, County Louth, Ireland (call)
Subspecies
Sometimes considered to form a superspecies with Mew Gull (Larus canus).