| Markham to Oakley (California) | 1,810.43 mi (2,913.60 km) |
| Markham to Oakton (Virginia) | 578.58 mi (931.14 km) |
| Markham to Oakville (Missouri) | 258.40 mi (415.86 km) |
| Markham to Oatfield (Oregon) | 1,754.78 mi (2,824.04 km) |
| Markham to Ocala (Florida) | 912.69 mi (1,468.84 km) |
| Markham to Ocean Acres (New Jersey) | 713.59 mi (1,148.40 km) |
| Markham to Ocean City (New Jersey) | 706.17 mi (1,136.47 km) |
| Markham to Ocean Pines (Maryland) | 699.28 mi (1,125.39 km) |
| Markham to Ocean Pointe (Hawaii) | 4,255.70 mi (6,848.88 km) |
| Markham to Ocean Springs (Mississippi) | 775.68 mi (1,248.34 km) |
| Markham to Oceanside (California) | 1,715.18 mi (2,760.32 km) |
| Markham to Oceanside (New York) | 733.78 mi (1,180.91 km) |
| Markham to Ocoee (Florida) | 963.93 mi (1,551.29 km) |
| Markham to Oconomowoc (Wisconsin) | 111.46 mi (179.37 km) |
| Markham to Odenton (Maryland) | 604.57 mi (972.96 km) |
