| Tigard to Odenton (Maryland) | 2,364.70 mi (3,805.62 km) |
| Tigard to Odessa (Texas) | 1,438.89 mi (2,315.67 km) |
| Tigard to Ogden (Utah) | 615.39 mi (990.38 km) |
| Tigard to Oildale (California) | 717.99 mi (1,155.50 km) |
| Tigard to Ojus (Florida) | 2,701.12 mi (4,347.04 km) |
| Tigard to Okemos (Michigan) | 1,896.08 mi (3,051.45 km) |
| Tigard to Oklahoma City (Oklahoma) | 1,487.47 mi (2,393.85 km) |
| Tigard to Okmulgee (Oklahoma) | 1,551.40 mi (2,496.74 km) |
| Tigard to Olathe (Kansas) | 1,493.24 mi (2,403.14 km) |
| Tigard to Old Jamestown (Missouri) | 1,713.39 mi (2,757.44 km) |
| Tigard to Oldsmar (Florida) | 2,489.71 mi (4,006.80 km) |
| Tigard to Olean (New York) | 2,197.35 mi (3,536.30 km) |
| Tigard to Olive Branch (Mississippi) | 1,866.30 mi (3,003.52 km) |
| Tigard to Olivehurst (California) | 442.80 mi (712.62 km) |
| Tigard to Olney (Maryland) | 2,344.06 mi (3,772.40 km) |
