Welton le Marsh is a village in Lincolnshire, England.
It is situated within the PE23 postcode district, which is within the Spilsby post town.
PE23 is the only postcode district within the Spilsby post town.
The Spilsby post town is within the Peterborough postcode area.
Administrative Ward: Willoughby with Sloothby
Administrative District: East Lindsey
Administrative County: Lincolnshire
Country: England
UK Parliament: Louth and Horncastle
NHS Local Health Authority: East Midlands
NHS Region: North, Midlands and the East