| Johnston to Orangevale (California) | 1,459.78 mi (2,349.29 km) |
| Johnston to Orchards (Washington) | 1,457.23 mi (2,345.18 km) |
| Johnston to Orcutt (California) | 1,515.68 mi (2,439.24 km) |
| Johnston to Oregon (Ohio) | 530.83 mi (854.29 km) |
| Johnston to Oregon (Wisconsin) | 237.28 mi (381.87 km) |
| Johnston to Oregon City (Oregon) | 1,460.18 mi (2,349.93 km) |
| Johnston to Orem (Utah) | 940.64 mi (1,513.81 km) |
| Johnston to Orinda (California) | 1,526.39 mi (2,456.49 km) |
| Johnston to Orland Park (Illinois) | 302.62 mi (487.01 km) |
| Johnston to Orlando (Florida) | 1,148.02 mi (1,847.55 km) |
| Johnston to Ormond Beach (Florida) | 1,109.79 mi (1,786.03 km) |
| Johnston to Oro Valley (Arizona) | 1,143.44 mi (1,840.18 km) |
| Johnston to Oroville (California) | 1,462.01 mi (2,352.88 km) |
| Johnston to Oshkosh (Wisconsin) | 306.99 mi (494.05 km) |
| Johnston to Oskaloosa (Iowa) | 62.46 mi (100.51 km) |
