| Rialto to Orangeburg (South Carolina) | 2,085.94 mi (3,357.00 km) |
| Rialto to Orangevale (California) | 380.87 mi (612.95 km) |
| Rialto to Orchards (Washington) | 844.20 mi (1,358.61 km) |
| Rialto to Orcutt (California) | 180.35 mi (290.24 km) |
| Rialto to Oregon (Ohio) | 1,909.84 mi (3,073.59 km) |
| Rialto to Oregon (Wisconsin) | 1,621.82 mi (2,610.07 km) |
| Rialto to Oregon City (Oregon) | 822.87 mi (1,324.27 km) |
| Rialto to Orem (Utah) | 529.25 mi (851.75 km) |
| Rialto to Orinda (California) | 373.11 mi (600.47 km) |
| Rialto to Orland Park (Illinois) | 1,682.17 mi (2,707.20 km) |
| Rialto to Orlando (Florida) | 2,152.48 mi (3,464.08 km) |
| Rialto to Ormond Beach (Florida) | 2,147.49 mi (3,456.04 km) |
| Rialto to Oro Valley (Arizona) | 388.47 mi (625.18 km) |
| Rialto to Oroville (California) | 437.62 mi (704.27 km) |
| Rialto to Oshkosh (Wisconsin) | 1,679.75 mi (2,703.30 km) |
