| Porthcawl to Jacksonville (Texas) | 4,590.61 mi (7,387.87 km) |
| Porthcawl to Jacksonville Beach (Florida) | 4,104.69 mi (6,605.86 km) |
| Porthcawl to James Island (South Carolina) | 3,924.29 mi (6,315.53 km) |
| Porthcawl to Jamestown (New York) | 3,469.82 mi (5,584.14 km) |
| Porthcawl to Jamestown (North Dakota) | 3,987.30 mi (6,416.94 km) |
| Porthcawl to Janesville (Wisconsin) | 3,828.15 mi (6,160.82 km) |
| Porthcawl to Jasmine Estates (Florida) | 4,256.85 mi (6,850.73 km) |
| Porthcawl to Jasper (Alabama) | 4,174.60 mi (6,718.38 km) |
| Porthcawl to Jasper (Indiana) | 3,944.73 mi (6,348.43 km) |
| Porthcawl to Jefferson (Georgia) | 4,010.06 mi (6,453.57 km) |
| Porthcawl to Jefferson (Louisiana) | 4,485.04 mi (7,217.97 km) |
| Porthcawl to Jefferson City (Missouri) | 4,142.68 mi (6,667.00 km) |
| Porthcawl to Jefferson Hills (Pennsylvania) | 3,576.40 mi (5,755.66 km) |
| Porthcawl to Jefferson Valley-Yorktown (New York) | 3,281.38 mi (5,280.87 km) |
| Porthcawl to Jeffersontown (Kentucky) | 3,898.66 mi (6,274.29 km) |
