| population_ref = (2011)<ref>[https://www.citypopulation.de/php/uk-england-southeastengland.php?cityid=E34002637 City Population]; adalwyd 9 Tachwedd 2017.</ref>
Tref yng [[Gorllewin Sussex|Ngorllewin Sussex]], [[De-ddwyrain Lloegr]], ydy '''Selsey'''.<ref>[https://britishplacenames.uk/selsey-west-sussex-sz853932#.XR03Ra2ZNlc British Place Names]; adalwyd 3 Gorffennaf 2019</ref>