| Calheta to Olympia Heights (Florida) | 3,785.09 mi (6,091.52 km) |
| Calheta to Omaha (Nebraska) | 4,243.51 mi (6,829.26 km) |
| Calheta to On Top of the World Designated Place (Florida) | 3,806.76 mi (6,126.39 km) |
| Calheta to Onalaska (Wisconsin) | 3,953.21 mi (6,362.08 km) |
| Calheta to Oneida (New York) | 3,202.01 mi (5,153.13 km) |
| Calheta to Oneonta (New York) | 3,177.77 mi (5,114.13 km) |
| Calheta to Ontario (California) | 5,516.85 mi (8,878.51 km) |
| Calheta to Ontario (Oregon) | 5,125.17 mi (8,248.17 km) |
| Calheta to Opa-locka (Florida) | 3,775.53 mi (6,076.13 km) |
| Calheta to Opelika (Alabama) | 3,890.89 mi (6,261.78 km) |
| Calheta to Opelousas (Louisiana) | 4,311.95 mi (6,939.42 km) |
| Calheta to Orange (California) | 5,536.05 mi (8,909.42 km) |
| Calheta to Orange (Texas) | 4,414.76 mi (7,104.88 km) |
| Calheta to Orange City (Florida) | 3,754.90 mi (6,042.93 km) |
| Calheta to Orangeburg (South Carolina) | 3,625.38 mi (5,834.48 km) |
