Pentre-rhew is located in the county of Dyfed, Wales, three miles south of the town of Tregaron, 38 miles north of the major city of Swansea, 58 miles north-west of Cardiff, and 170 miles west of London. Pentre-rhew was historically in the county of Cardiganshire. Pentre-rhew falls within the unitary authority of Sir Ceredigion - Ceredigion. It is in the SY25 postcode district.


Pentre-rhew is in the ceremonial county of Dyfed, the historic county of Cardiganshire, and the administrative county of Sir Ceredigion - Ceredigion.
| Ceremonial County | Dyfed |
|---|---|
| Historic County | Cardiganshire |
| Administrative County | Sir Ceredigion - Ceredigion |
Pentre-rhew is situated roughly centrally between the southernmost and northernmost extremities of Dyfed, and towards the easternmost extremity of Dyfed.

The nearest postcode to the centre of Pentre-rhew is SY25 6SB.
Pentre-rhew is situated towards the southernmost extremity of the SY25 postcode district, and roughly centrally between the easternmost and westernmost extremities of the SY25 postcode district.

The centre of Pentre-rhew is located at position 52.17606° latitude and -3.95049° longitude.
| Latitude | 52.17606° |
|---|---|
| Longitude | -3.95049° |
The centre of Pentre-rhew is located at the grid reference easting 266723 and northing 254883 within the British National Grid (OSGB36) system.
| Easting | 266723 |
|---|---|
| Northing | 254883 |
Position of Pentre-rhew relative to nearby towns. Distance is measured from the centre of Pentre-rhew to the centre of the town.
Position of Pentre-rhew relative to nearby cities. Distance is measured from the centre of Pentre-rhew to the centre of the city.