| Gig Harbor to Olympia Heights (Florida) | 2,732.81 mi (4,398.03 km) |
| Gig Harbor to Omaha (Nebraska) | 1,370.24 mi (2,205.19 km) |
| Gig Harbor to On Top of the World Designated Place (Florida) | 2,486.02 mi (4,000.87 km) |
| Gig Harbor to Onalaska (Wisconsin) | 1,525.04 mi (2,454.31 km) |
| Gig Harbor to Oneida (New York) | 2,268.67 mi (3,651.07 km) |
| Gig Harbor to Oneonta (New York) | 2,314.00 mi (3,724.03 km) |
| Gig Harbor to Ontario (California) | 954.61 mi (1,536.29 km) |
| Gig Harbor to Ontario (Oregon) | 354.65 mi (570.75 km) |
| Gig Harbor to Opa-locka (Florida) | 2,728.08 mi (4,390.42 km) |
| Gig Harbor to Opelika (Alabama) | 2,187.51 mi (3,520.45 km) |
| Gig Harbor to Opelousas (Louisiana) | 1,989.00 mi (3,200.99 km) |
| Gig Harbor to Orange (California) | 967.44 mi (1,556.94 km) |
| Gig Harbor to Orange (Texas) | 1,938.13 mi (3,119.12 km) |
| Gig Harbor to Orange City (Florida) | 2,538.94 mi (4,086.04 km) |
| Gig Harbor to Orangeburg (South Carolina) | 2,359.54 mi (3,797.31 km) |
