| Piqua to Oakleaf Plantation (Florida) | 702.90 mi (1,131.20 km) |
| Piqua to Oakley (California) | 1,999.58 mi (3,218.01 km) |
| Piqua to Oakton (Virginia) | 380.05 mi (611.63 km) |
| Piqua to Oakville (Missouri) | 345.41 mi (555.89 km) |
| Piqua to Oatfield (Oregon) | 1,959.22 mi (3,153.05 km) |
| Piqua to Ocala (Florida) | 767.34 mi (1,234.91 km) |
| Piqua to Ocean Acres (New Jersey) | 528.24 mi (850.12 km) |
| Piqua to Ocean City (New Jersey) | 515.86 mi (830.20 km) |
| Piqua to Ocean Pines (Maryland) | 501.33 mi (806.82 km) |
| Piqua to Ocean Pointe (Hawaii) | 4,444.63 mi (7,152.95 km) |
| Piqua to Ocean Springs (Mississippi) | 719.95 mi (1,158.65 km) |
| Piqua to Oceanside (California) | 1,881.57 mi (3,028.10 km) |
| Piqua to Oceanside (New York) | 558.87 mi (899.41 km) |
| Piqua to Ocoee (Florida) | 814.17 mi (1,310.28 km) |
| Piqua to Oconomowoc (Wisconsin) | 299.45 mi (481.91 km) |
