| Grass Valley to Odessa (Texas) | 1,164.54 mi (1,874.15 km) |
| Grass Valley to Ogden (Utah) | 498.54 mi (802.32 km) |
| Grass Valley to Oildale (California) | 284.71 mi (458.20 km) |
| Grass Valley to Ojus (Florida) | 2,525.49 mi (4,064.38 km) |
| Grass Valley to Okemos (Michigan) | 1,911.50 mi (3,076.25 km) |
| Grass Valley to Oklahoma City (Oklahoma) | 1,314.79 mi (2,115.95 km) |
| Grass Valley to Okmulgee (Oklahoma) | 1,392.18 mi (2,240.51 km) |
| Grass Valley to Olathe (Kansas) | 1,402.74 mi (2,257.49 km) |
| Grass Valley to Old Jamestown (Missouri) | 1,643.55 mi (2,645.04 km) |
| Grass Valley to Oldsmar (Florida) | 2,318.89 mi (3,731.89 km) |
| Grass Valley to Olean (New York) | 2,219.65 mi (3,572.18 km) |
| Grass Valley to Olive Branch (Mississippi) | 1,736.04 mi (2,793.88 km) |
| Grass Valley to Olivehurst (California) | 28.81 mi (46.36 km) |
| Grass Valley to Olney (Maryland) | 2,331.53 mi (3,752.24 km) |
| Grass Valley to Olympia (Washington) | 548.06 mi (882.02 km) |
