Pen-y-bryn is located in the county of West Glamorgan, Wales, four miles south of the town of Maesteg, 12 miles south-east of the major city of Swansea, 22 miles west of Cardiff, and 153 miles west of London. Pen-y-bryn lies just south-west of the Mid Glamorgan border, and was historically in the county of Glamorgan. Pen-y-bryn falls within the unitary authority of Castell-nedd Port Talbot - Neath Port Talbot. It is in the CF33 postcode district. The post town for Pen-y-bryn is Bridgend.


Pen-y-bryn is in the ceremonial county of West Glamorgan, the historic county of Glamorgan, and the administrative county of Castell-nedd Port Talbot - Neath Port Talbot.
| Ceremonial County | West Glamorgan |
|---|---|
| Historic County | Glamorgan |
| Administrative County | Castell-nedd Port Talbot - Neath Port Talbot |
Pen-y-bryn is situated towards the southernmost extremity of West Glamorgan, and towards the easternmost extremity of West Glamorgan.

The nearest postcode to the centre of Pen-y-bryn is CF33 6RA.
Pen-y-bryn is situated towards the northernmost extremity of the CF33 postcode district, and towards the easternmost extremity of the CF33 postcode district.

The post town for Pen-y-bryn is Bridgend. Pen-y-bryn is in the CF33 postcode district, which corresponds to the post town of Bridgend.
The centre of Pen-y-bryn is located at position 51.54781° latitude and -3.67986° longitude.
| Latitude | 51.54781° |
|---|---|
| Longitude | -3.67986° |
The centre of Pen-y-bryn is located at the grid reference easting 283615 and northing 184550 within the British National Grid (OSGB36) system.
| Easting | 283615 |
|---|---|
| Northing | 184550 |
Position of Pen-y-bryn relative to nearby towns. Distance is measured from the centre of Pen-y-bryn to the centre of the town.
Position of Pen-y-bryn relative to nearby cities. Distance is measured from the centre of Pen-y-bryn to the centre of the city.