| Giffnock to Oakley (California) | 4,990.10 mi (8,030.79 km) |
| Giffnock to Oakton (Virginia) | 3,432.18 mi (5,523.57 km) |
| Giffnock to Oakville (Missouri) | 3,937.46 mi (6,336.72 km) |
| Giffnock to Oatfield (Oregon) | 4,580.54 mi (7,371.67 km) |
| Giffnock to Ocala (Florida) | 4,115.96 mi (6,624.00 km) |
| Giffnock to Ocean Acres (New Jersey) | 3,275.85 mi (5,271.97 km) |
| Giffnock to Ocean City (New Jersey) | 3,311.04 mi (5,328.60 km) |
| Giffnock to Ocean Pines (Maryland) | 3,374.93 mi (5,431.42 km) |
| Giffnock to Ocean Pointe (Hawaii) | 6,890.09 mi (11,088.52 km) |
| Giffnock to Ocean Springs (Mississippi) | 4,302.97 mi (6,924.97 km) |
| Giffnock to Oceanside (California) | 5,138.55 mi (8,269.70 km) |
| Giffnock to Oceanside (New York) | 3,208.75 mi (5,163.98 km) |
| Giffnock to Ocoee (Florida) | 4,124.09 mi (6,637.07 km) |
| Giffnock to Oconomowoc (Wisconsin) | 3,638.07 mi (5,854.91 km) |
| Giffnock to Odenton (Maryland) | 3,400.45 mi (5,472.50 km) |
