| Grumo Nevano to Olympia Heights (Florida) | 5,300.78 mi (8,530.79 km) |
| Grumo Nevano to Omaha (Nebraska) | 5,279.72 mi (8,496.89 km) |
| Grumo Nevano to On Top of the World Designated Place (Florida) | 5,245.21 mi (8,441.35 km) |
| Grumo Nevano to Onalaska (Wisconsin) | 4,975.03 mi (8,006.54 km) |
| Grumo Nevano to Oneida (New York) | 4,378.74 mi (7,046.91 km) |
| Grumo Nevano to Oneonta (New York) | 4,376.17 mi (7,042.77 km) |
| Grumo Nevano to Ontario (California) | 6,420.84 mi (10,333.35 km) |
| Grumo Nevano to Ontario (Oregon) | 5,832.87 mi (9,387.10 km) |
| Grumo Nevano to Opa-locka (Florida) | 5,289.07 mi (8,511.93 km) |
| Grumo Nevano to Opelika (Alabama) | 5,230.21 mi (8,417.21 km) |
| Grumo Nevano to Opelousas (Louisiana) | 5,623.93 mi (9,050.84 km) |
| Grumo Nevano to Orange (California) | 6,441.24 mi (10,366.18 km) |
| Grumo Nevano to Orange (Texas) | 5,715.95 mi (9,198.94 km) |
| Grumo Nevano to Orange City (Florida) | 5,205.89 mi (8,378.06 km) |
| Grumo Nevano to Orangeburg (South Carolina) | 4,990.71 mi (8,031.77 km) |
