Kirkby Underwood is a village in Lincolnshire, England.
It is situated within the PE10 postcode district, which is within the Bourne post town.
PE10 is the only postcode district within the Bourne post town.
The Bourne post town is within the Peterborough postcode area.
Administrative Ward: Aveland
Administrative District: South Kesteven
Administrative County: Lincolnshire
Country: England
UK Parliament: Grantham and Stamford
NHS Local Health Authority: East Midlands
NHS Region: North, Midlands and the East