| Johnston to Oakley (California) | 1,498.94 mi (2,412.31 km) |
| Johnston to Oakton (Virginia) | 885.39 mi (1,424.90 km) |
| Johnston to Oakville (Missouri) | 287.34 mi (462.43 km) |
| Johnston to Oatfield (Oregon) | 1,460.23 mi (2,350.02 km) |
| Johnston to Ocala (Florida) | 1,080.34 mi (1,738.64 km) |
| Johnston to Ocean Acres (New Jersey) | 1,024.83 mi (1,649.30 km) |
| Johnston to Ocean City (New Jersey) | 1,016.59 mi (1,636.04 km) |
| Johnston to Ocean Pines (Maryland) | 1,006.62 mi (1,620.01 km) |
| Johnston to Ocean Pointe (Hawaii) | 3,944.25 mi (6,347.66 km) |
| Johnston to Ocean Springs (Mississippi) | 826.52 mi (1,330.16 km) |
| Johnston to Oceanside (California) | 1,413.58 mi (2,274.93 km) |
| Johnston to Oceanside (New York) | 1,045.05 mi (1,681.84 km) |
| Johnston to Ocoee (Florida) | 1,135.50 mi (1,827.41 km) |
| Johnston to Oconomowoc (Wisconsin) | 283.93 mi (456.94 km) |
| Johnston to Odenton (Maryland) | 912.89 mi (1,469.16 km) |
