| Longford to Odessa (Texas) | 4,649.65 mi (7,482.89 km) |
| Longford to Ogden (Utah) | 4,491.93 mi (7,229.06 km) |
| Longford to Oildale (California) | 5,042.11 mi (8,114.49 km) |
| Longford to Ojus (Florida) | 4,081.03 mi (6,567.78 km) |
| Longford to Okemos (Michigan) | 3,430.51 mi (5,520.87 km) |
| Longford to Oklahoma City (Oklahoma) | 4,280.51 mi (6,888.81 km) |
| Longford to Okmulgee (Oklahoma) | 4,216.03 mi (6,785.04 km) |
| Longford to Olathe (Kansas) | 4,006.91 mi (6,448.50 km) |
| Longford to Old Jamestown (Missouri) | 3,837.23 mi (6,175.43 km) |
| Longford to Oldsmar (Florida) | 4,074.82 mi (6,557.79 km) |
| Longford to Olean (New York) | 3,226.03 mi (5,191.80 km) |
| Longford to Olive Branch (Mississippi) | 4,011.43 mi (6,455.78 km) |
| Longford to Olivehurst (California) | 4,915.48 mi (7,910.70 km) |
| Longford to Olney (Maryland) | 3,304.58 mi (5,318.21 km) |
| Longford to Olympia (Washington) | 4,506.77 mi (7,252.94 km) |
