| Round Rock to Isabela (Puerto Rico) | 2,088.92 mi (3,361.79 km) |
| Round Rock to Iselin (New Jersey) | 1,478.08 mi (2,378.75 km) |
| Round Rock to Isla Vista (California) | 1,318.64 mi (2,122.14 km) |
| Round Rock to Issaquah (Washington) | 1,745.52 mi (2,809.15 km) |
| Round Rock to Ithaca (New York) | 1,428.65 mi (2,299.19 km) |
| Round Rock to Ives Estates (Florida) | 1,108.36 mi (1,783.74 km) |
| Round Rock to Jackson (Michigan) | 1,092.47 mi (1,758.15 km) |
| Round Rock to Jackson (Mississippi) | 456.29 mi (734.34 km) |
| Round Rock to Jackson (Missouri) | 659.01 mi (1,060.58 km) |
| Round Rock to Jackson (Tennessee) | 621.39 mi (1,000.03 km) |
| Round Rock to Jackson (Wyoming) | 1,147.38 mi (1,846.52 km) |
| Round Rock to Jacksonville (Alabama) | 732.00 mi (1,178.04 km) |
| Round Rock to Jacksonville (Arkansas) | 440.30 mi (708.60 km) |
| Round Rock to Jacksonville (Florida) | 951.87 mi (1,531.89 km) |
| Round Rock to Jacksonville (Illinois) | 761.34 mi (1,225.25 km) |
