| Armthorpe to Olympia Heights (Florida) | 4,376.81 mi (7,043.79 km) |
| Armthorpe to Omaha (Nebraska) | 4,184.56 mi (6,734.40 km) |
| Armthorpe to On Top of the World Designated Place (Florida) | 4,279.95 mi (6,887.91 km) |
| Armthorpe to Onalaska (Wisconsin) | 3,882.69 mi (6,248.59 km) |
| Armthorpe to Oneida (New York) | 3,341.20 mi (5,377.14 km) |
| Armthorpe to Oneonta (New York) | 3,345.73 mi (5,384.44 km) |
| Armthorpe to Ontario (California) | 5,299.63 mi (8,528.93 km) |
| Armthorpe to Ontario (Oregon) | 4,709.04 mi (7,578.47 km) |
| Armthorpe to Opa-locka (Florida) | 4,364.22 mi (7,023.53 km) |
| Armthorpe to Opelika (Alabama) | 4,220.64 mi (6,792.46 km) |
| Armthorpe to Opelousas (Louisiana) | 4,592.41 mi (7,390.77 km) |
| Armthorpe to Orange (California) | 5,320.01 mi (8,561.72 km) |
| Armthorpe to Orange (Texas) | 4,678.25 mi (7,528.91 km) |
| Armthorpe to Orange City (Florida) | 4,248.58 mi (6,837.42 km) |
| Armthorpe to Orangeburg (South Carolina) | 4,000.31 mi (6,437.88 km) |
