From Wikipedia, the free encyclopedia:

Carlingford may refer to:
* Carlingford, County Louth, a mediaeval village in Republic of Ireland
* Carlingford Lough, the sea loch where the village is located
* Carlingford, New South Wales, a suburb in north-west Sydney, Australia

There are numerous references to Carlingsford on the Internet, but I suspect they are all mistakes or variant spellings for the above 3 places.

Carlingsford is also fictional place in a series of novels by Margaret Oliphant.