I think the listings for British and U.S. English are interesting:
British Isles
British English | East Anglian English | English English | Estuary English | Hiberno-English (Ireland) | Highland English | Manx English | Mid Ulster English | Midlands English | Northern English | Received Pronunciation (?) | Scottish English | Welsh English | West Country dialects

United States
American English | African American Vernacular English | Appalachian English | Baltimorese | Boston English | California English | Chicano English | General American | Hawaiian English | Maine-New Hampshire English | Mid-Atlantic English | New York-New Jersey English | North Central American English | Pacific Northwest English | Pittsburgh English | Southern American English | Utah English | Yooper


Also Llanito (Gibraltar) .