Old Grimsby is a village in Cornwall, England.
It is situated within the TR24 postcode district, which is within the Isles of Scilly post town.
The full list of postcode districts within the Isles of Scilly post town is as follows:
The Isles of Scilly post town is within the Truro postcode area.
Administrative Ward: Tresco
Administrative District: Isles of Scilly
Country: England
UK Parliament: St Ives
NHS Local Health Authority: South West
NHS Region: Southern