| Perry Hall to Odenton (Maryland) | 26.22 mi (42.20 km) |
| Perry Hall to Odessa (Texas) | 1,536.19 mi (2,472.26 km) |
| Perry Hall to Ogden (Utah) | 1,860.92 mi (2,994.87 km) |
| Perry Hall to Oildale (California) | 2,329.59 mi (3,749.11 km) |
| Perry Hall to Ojus (Florida) | 953.45 mi (1,534.42 km) |
| Perry Hall to Okemos (Michigan) | 471.82 mi (759.33 km) |
| Perry Hall to Oklahoma City (Oklahoma) | 1,182.74 mi (1,903.44 km) |
| Perry Hall to Okmulgee (Oklahoma) | 1,099.55 mi (1,769.56 km) |
| Perry Hall to Olathe (Kansas) | 981.84 mi (1,580.11 km) |
| Perry Hall to Old Jamestown (Missouri) | 740.38 mi (1,191.53 km) |
| Perry Hall to Oldsmar (Florida) | 860.95 mi (1,385.57 km) |
| Perry Hall to Olean (New York) | 211.23 mi (339.95 km) |
| Perry Hall to Olive Branch (Mississippi) | 796.42 mi (1,281.71 km) |
| Perry Hall to Olivehurst (California) | 2,386.51 mi (3,840.72 km) |
| Perry Hall to Olney (Maryland) | 36.48 mi (58.72 km) |
