| Grass Valley to Oakley (California) | 91.86 mi (147.83 km) |
| Grass Valley to Oakton (Virginia) | 2,324.06 mi (3,740.22 km) |
| Grass Valley to Oakville (Missouri) | 1,646.92 mi (2,650.47 km) |
| Grass Valley to Oatfield (Oregon) | 434.77 mi (699.69 km) |
| Grass Valley to Ocala (Florida) | 2,309.01 mi (3,715.99 km) |
| Grass Valley to Ocean Acres (New Jersey) | 2,465.38 mi (3,967.64 km) |
| Grass Valley to Ocean City (New Jersey) | 2,457.23 mi (3,954.53 km) |
| Grass Valley to Ocean Pines (Maryland) | 2,445.32 mi (3,935.36 km) |
| Grass Valley to Ocean Pointe (Hawaii) | 2,504.95 mi (4,031.32 km) |
| Grass Valley to Ocean Springs (Mississippi) | 1,917.11 mi (3,085.29 km) |
| Grass Valley to Oceanside (California) | 463.95 mi (746.65 km) |
| Grass Valley to Oceanside (New York) | 2,483.35 mi (3,996.56 km) |
| Grass Valley to Ocoee (Florida) | 2,361.53 mi (3,800.51 km) |
| Grass Valley to Oconomowoc (Wisconsin) | 1,703.62 mi (2,741.71 km) |
| Grass Valley to Odenton (Maryland) | 2,352.53 mi (3,786.03 km) |
