| Gateway to Odessa (Texas) | 1,292.60 mi (2,080.24 km) |
| Gateway to Ogden (Utah) | 1,991.87 mi (3,205.60 km) |
| Gateway to Oildale (California) | 2,276.52 mi (3,663.70 km) |
| Gateway to Ojus (Florida) | 107.17 mi (172.47 km) |
| Gateway to Okemos (Michigan) | 1,124.34 mi (1,809.45 km) |
| Gateway to Oklahoma City (Oklahoma) | 1,115.25 mi (1,794.82 km) |
| Gateway to Okmulgee (Oklahoma) | 1,047.65 mi (1,686.03 km) |
| Gateway to Olathe (Kansas) | 1,137.78 mi (1,831.08 km) |
| Gateway to Old Jamestown (Missouri) | 980.73 mi (1,578.33 km) |
| Gateway to Oldsmar (Florida) | 116.45 mi (187.40 km) |
| Gateway to Olean (New York) | 1,087.43 mi (1,750.05 km) |
| Gateway to Olive Branch (Mississippi) | 752.19 mi (1,210.54 km) |
| Gateway to Olivehurst (California) | 2,444.47 mi (3,934.00 km) |
| Gateway to Olney (Maryland) | 909.31 mi (1,463.39 km) |
| Gateway to Olympia (Washington) | 2,636.19 mi (4,242.53 km) |
