| East Chicago to Odessa (Texas) | 1,062.50 mi (1,709.93 km) |
| East Chicago to Ogden (Utah) | 1,265.80 mi (2,037.10 km) |
| East Chicago to Oildale (California) | 1,749.11 mi (2,814.92 km) |
| East Chicago to Ojus (Florida) | 1,161.04 mi (1,868.52 km) |
| East Chicago to Okemos (Michigan) | 172.03 mi (276.85 km) |
| East Chicago to Oklahoma City (Oklahoma) | 690.32 mi (1,110.96 km) |
| East Chicago to Okmulgee (Oklahoma) | 621.40 mi (1,000.05 km) |
| East Chicago to Olathe (Kansas) | 432.53 mi (696.09 km) |
| East Chicago to Old Jamestown (Missouri) | 244.73 mi (393.85 km) |
| East Chicago to Oldsmar (Florida) | 977.36 mi (1,572.91 km) |
| East Chicago to Olean (New York) | 465.01 mi (748.36 km) |
| East Chicago to Olive Branch (Mississippi) | 479.76 mi (772.10 km) |
| East Chicago to Olivehurst (California) | 1,792.33 mi (2,884.48 km) |
| East Chicago to Olney (Maryland) | 572.58 mi (921.48 km) |
| East Chicago to Olympia (Washington) | 1,774.44 mi (2,855.68 km) |
