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.
 
Population
Estimated population is 2,600,000 (2010).
Ring-billed Gull (Larus delawarensis) [XC623896]
by Thomas Ryder Payne from Rahway River Park (near Rahway), Union County, New Jersey, United States (call)
Ring-billed Gull (Larus delawarensis) [XC858923]
by Skyler Bol from Des Mille-\u00eeles \/ Face Au 7100 (near Laval), Laval, Qu\u00e9bec, Canada (flight call)
Subspecies
Sometimes considered to form a superspecies with Mew Gull (Larus canus).