| Morpeth to Olympia Heights (Florida) | 4,337.03 mi (6,979.77 km) |
| Morpeth to Omaha (Nebraska) | 4,105.77 mi (6,607.59 km) |
| Morpeth to On Top of the World Designated Place (Florida) | 4,232.76 mi (6,811.96 km) |
| Morpeth to Onalaska (Wisconsin) | 3,805.27 mi (6,123.99 km) |
| Morpeth to Oneida (New York) | 3,280.77 mi (5,279.90 km) |
| Morpeth to Oneonta (New York) | 3,287.07 mi (5,290.03 km) |
| Morpeth to Ontario (California) | 5,207.43 mi (8,380.55 km) |
| Morpeth to Ontario (Oregon) | 4,610.69 mi (7,420.19 km) |
| Morpeth to Opa-locka (Florida) | 4,324.32 mi (6,959.32 km) |
| Morpeth to Opelika (Alabama) | 4,164.51 mi (6,702.12 km) |
| Morpeth to Opelousas (Louisiana) | 4,530.56 mi (7,291.23 km) |
| Morpeth to Orange (California) | 5,227.78 mi (8,413.29 km) |
| Morpeth to Orange (Texas) | 4,614.80 mi (7,426.80 km) |
| Morpeth to Orange City (Florida) | 4,203.01 mi (6,764.09 km) |
| Morpeth to Orangeburg (South Carolina) | 3,948.84 mi (6,355.04 km) |
