[3] The parish touches Gayton le Marsh, Mablethorpe and Sutton, Theddlethorpe All Saints and Withern with Stain.

[6] In the Domesday Book of 1086, Theddlethorpe appears as Tedlagestorp, believed to mean "outlying farmstead or hamlet of a man called Theodlac".

[11] The parish church is a Grade II* listed building dedicated to St Helen, dating from the 14th–15th centuries.

[14] Theddlethorpe Hall is a Grade II listed red-brick country house from the late 17th century, with early 18th and 19th-century alterations.

[15] The Stable Block is also Grade II listed and dates from the 19th century.