Colgrain is a village in Argyll and Bute, Scotland.
It is situated within the G82 postcode district, which is within the Dumbarton post town.
G82 is the only postcode district within the Dumbarton post town.
The Dumbarton post town is within the Glasgow postcode area.
Administrative Ward: Helensburgh and Lomond South
Administrative District: Argyll and Bute
Country: Scotland
UK Parliament: Argyll and Bute
NHS Local Health Authority: Highland