Llan-fair is located in the county of South Glamorgan, Wales, two miles south of the town of Cowbridge, 21 miles west of the major town of Weston-Super-Mare, 12 miles west of Cardiff, and 143 miles west of London. Llan-fair lies five miles south of the Mid Glamorgan border, and was historically in the county of Glamorgan. Llan-fair falls within the unitary authority of Bro Morgannwg - the Vale of Glamorgan. It is in the CF71 postcode district.


Llan-fair is in the ceremonial county of South Glamorgan, the historic county of Glamorgan, and the administrative county of Bro Morgannwg - the Vale of Glamorgan.
| Ceremonial County | South Glamorgan |
|---|---|
| Historic County | Glamorgan |
| Administrative County | Bro Morgannwg - the Vale of Glamorgan |
Llan-fair is situated towards the southernmost extremity of South Glamorgan, and roughly centrally between the easternmost and westernmost extremities of South Glamorgan.

The nearest postcode to the centre of Llan-fair is CF71 7PH.
Llan-fair is situated towards the southernmost extremity of the CF71 postcode district, and roughly centrally between the easternmost and westernmost extremities of the CF71 postcode district.

The centre of Llan-fair is located at position 51.43601° latitude and -3.44005° longitude.
| Latitude | 51.43601° |
|---|---|
| Longitude | -3.44005° |
The centre of Llan-fair is located at the grid reference easting 299998 and northing 171763 within the British National Grid (OSGB36) system.
| Easting | 299998 |
|---|---|
| Northing | 171763 |
Position of Llan-fair relative to nearby towns. Distance is measured from the centre of Llan-fair to the centre of the town.
Position of Llan-fair relative to nearby cities. Distance is measured from the centre of Llan-fair to the centre of the city.