| Rhondda to Carson (California) | 5,340.95 mi (8,595.43 km) |
| Rhondda to Carson City (Nevada) | 5,089.43 mi (8,190.65 km) |
| Rhondda to Carteret (New Jersey) | 3,338.65 mi (5,373.03 km) |
| Rhondda to Cartersville (Georgia) | 4,066.65 mi (6,544.64 km) |
| Rhondda to Carthage (Missouri) | 4,301.28 mi (6,922.23 km) |
| Rhondda to Cary (Illinois) | 3,826.56 mi (6,158.25 km) |
| Rhondda to Cary (North Carolina) | 3,743.26 mi (6,024.19 km) |
| Rhondda to Casa de Oro-Mount Helix (California) | 5,358.22 mi (8,623.22 km) |
| Rhondda to Casa Grande (Arizona) | 5,169.85 mi (8,320.07 km) |
| Rhondda to Casas Adobes (Arizona) | 5,173.96 mi (8,326.69 km) |
| Rhondda to Cascades (Virginia) | 3,535.76 mi (5,690.25 km) |
| Rhondda to Casper (Wyoming) | 4,452.86 mi (7,166.19 km) |
| Rhondda to Casselberry (Florida) | 4,190.48 mi (6,743.93 km) |
| Rhondda to Castaic (California) | 5,316.99 mi (8,556.86 km) |
| Rhondda to Castle Pines (Colorado) | 4,576.27 mi (7,364.80 km) |
