| Pontneddfechan to Jacksonville (Texas) | 4,587.45 mi (7,382.79 km) |
| Pontneddfechan to Jacksonville Beach (Florida) | 4,105.24 mi (6,606.75 km) |
| Pontneddfechan to James Island (South Carolina) | 3,924.49 mi (6,315.85 km) |
| Pontneddfechan to Jamestown (New York) | 3,467.20 mi (5,579.91 km) |
| Pontneddfechan to Jamestown (North Dakota) | 3,979.56 mi (6,404.48 km) |
| Pontneddfechan to Janesville (Wisconsin) | 3,823.40 mi (6,153.16 km) |
| Pontneddfechan to Jasmine Estates (Florida) | 4,257.63 mi (6,851.99 km) |
| Pontneddfechan to Jasper (Alabama) | 4,172.78 mi (6,715.44 km) |
| Pontneddfechan to Jasper (Indiana) | 3,941.68 mi (6,343.52 km) |
| Pontneddfechan to Jefferson (Georgia) | 4,009.00 mi (6,451.86 km) |
| Pontneddfechan to Jefferson (Louisiana) | 4,483.58 mi (7,215.62 km) |
| Pontneddfechan to Jefferson City (Missouri) | 4,138.47 mi (6,660.23 km) |
| Pontneddfechan to Jefferson Hills (Pennsylvania) | 3,574.24 mi (5,752.18 km) |
| Pontneddfechan to Jefferson Valley-Yorktown (New York) | 3,280.16 mi (5,278.90 km) |
| Pontneddfechan to Jeffersontown (Kentucky) | 3,895.96 mi (6,269.94 km) |
