| Owings Mills to Oakleaf Plantation (Florida) | 699.45 mi (1,125.65 km) |
| Owings Mills to Oakley (California) | 2,398.00 mi (3,859.20 km) |
| Owings Mills to Oakton (Virginia) | 45.30 mi (72.91 km) |
| Owings Mills to Oakville (Missouri) | 729.50 mi (1,174.01 km) |
| Owings Mills to Oatfield (Oregon) | 2,340.55 mi (3,766.75 km) |
| Owings Mills to Ocala (Florida) | 770.02 mi (1,239.22 km) |
| Owings Mills to Ocean Acres (New Jersey) | 135.65 mi (218.32 km) |
| Owings Mills to Ocean City (New Jersey) | 117.40 mi (188.95 km) |
| Owings Mills to Ocean Pines (Maryland) | 113.27 mi (182.29 km) |
| Owings Mills to Ocean Pointe (Hawaii) | 4,843.28 mi (7,794.50 km) |
| Owings Mills to Ocean Springs (Mississippi) | 919.76 mi (1,480.22 km) |
| Owings Mills to Oceanside (California) | 2,276.23 mi (3,663.23 km) |
| Owings Mills to Oceanside (New York) | 187.03 mi (300.99 km) |
| Owings Mills to Ocoee (Florida) | 795.85 mi (1,280.79 km) |
| Owings Mills to Oconomowoc (Wisconsin) | 658.41 mi (1,059.61 km) |
