It is located approximately 1 mile outside of Milford Haven belonging to the Tiers Cross community.

The Iron Age fort, Thornton Rath, was a defensive enclosure, whose remains can still be seen.

[2][3] The cemetery for Milford Haven and Steynton parish is in Thornton.

[4] There is a large number of military graves, including those of men who lost their lives in landing craft that foundered off the Welsh coast.

[5] Thornton Baptist Chapel was built in 1867 in simple round-headed style, and housed a British School in its lower level.