St Mary's, Isles of Scilly

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St Mary's Cornish: Ennor
Porthcressa, showing part of Hugh Town
St Mary's Location within Isles of Scilly
Area	6.58 km2 (2.54 sq mi)
Population	1,723 (2011)[1]
• Density	262/km2 (680/sq mi)
OS grid reference	SV915115
Civil parish	St Mary's
Unitary authority	Isles of Scilly
Ceremonial county	Cornwall
Region	South West
Country	England
Sovereign state	United Kingdom
Post town	ISLES OF SCILLY
Postcode district	TR21
Dialling code	01720
Police	Devon and Cornwall
Fire	Isles of Scilly
Ambulance	South Western
UK Parliament	St Ives
List of places UK England Cornwall 49°55′19″N 6°17′49″W / 49.922°N 6.297°W / 49.922; -6.297

St Mary's (Cornish: Ennor, lit. 'The Mainland') is the largest and most populous island of the Isles of Scilly, an archipelago off the southwest coast of Cornwall in England, United Kingdom.