| Glastonbury to Olympia Heights (Florida) | 4,330.00 mi (6,968.46 km) |
| Glastonbury to Omaha (Nebraska) | 4,208.63 mi (6,773.14 km) |
| Glastonbury to On Top of the World Designated Place (Florida) | 4,245.39 mi (6,832.29 km) |
| Glastonbury to Onalaska (Wisconsin) | 3,904.54 mi (6,283.75 km) |
| Glastonbury to Oneida (New York) | 3,331.80 mi (5,362.01 km) |
| Glastonbury to Oneonta (New York) | 3,333.16 mi (5,364.21 km) |
| Glastonbury to Ontario (California) | 5,351.94 mi (8,613.11 km) |
| Glastonbury to Ontario (Oregon) | 4,777.92 mi (7,689.31 km) |
| Glastonbury to Opa-locka (Florida) | 4,317.62 mi (6,948.54 km) |
| Glastonbury to Opelika (Alabama) | 4,201.48 mi (6,761.63 km) |
| Glastonbury to Opelousas (Louisiana) | 4,582.75 mi (7,375.22 km) |
| Glastonbury to Orange (California) | 5,372.36 mi (8,645.97 km) |
| Glastonbury to Orange (Texas) | 4,671.36 mi (7,517.83 km) |
| Glastonbury to Orange City (Florida) | 4,211.39 mi (6,777.58 km) |
| Glastonbury to Orangeburg (South Carolina) | 3,973.55 mi (6,394.82 km) |
