| Pittsburgh to Odenton (Maryland) | 198.50 mi (319.46 km) |
| Pittsburgh to Odessa (Texas) | 1,375.61 mi (2,213.82 km) |
| Pittsburgh to Ogden (Utah) | 1,663.84 mi (2,677.69 km) |
| Pittsburgh to Oildale (California) | 2,138.54 mi (3,441.64 km) |
| Pittsburgh to Ojus (Florida) | 1,000.76 mi (1,610.57 km) |
| Pittsburgh to Okemos (Michigan) | 277.64 mi (446.82 km) |
| Pittsburgh to Oklahoma City (Oklahoma) | 1,013.19 mi (1,630.58 km) |
| Pittsburgh to Okmulgee (Oklahoma) | 932.34 mi (1,500.46 km) |
| Pittsburgh to Olathe (Kansas) | 795.86 mi (1,280.81 km) |
| Pittsburgh to Old Jamestown (Missouri) | 559.16 mi (899.89 km) |
| Pittsburgh to Oldsmar (Florida) | 869.59 mi (1,399.47 km) |
| Pittsburgh to Olean (New York) | 138.94 mi (223.61 km) |
| Pittsburgh to Olive Branch (Mississippi) | 658.47 mi (1,059.70 km) |
| Pittsburgh to Olivehurst (California) | 2,189.97 mi (3,524.42 km) |
| Pittsburgh to Olney (Maryland) | 178.21 mi (286.81 km) |
