| Zachary to Orangeburg (South Carolina) | 633.33 mi (1,019.25 km) |
| Zachary to Orangevale (California) | 1,786.23 mi (2,874.65 km) |
| Zachary to Orchards (Washington) | 1,975.96 mi (3,180.00 km) |
| Zachary to Orcutt (California) | 1,718.29 mi (2,765.31 km) |
| Zachary to Oregon (Ohio) | 872.25 mi (1,403.75 km) |
| Zachary to Oregon (Wisconsin) | 852.76 mi (1,372.39 km) |
| Zachary to Oregon City (Oregon) | 1,970.42 mi (3,171.08 km) |
| Zachary to Orem (Utah) | 1,328.63 mi (2,138.22 km) |
| Zachary to Orinda (California) | 1,830.29 mi (2,945.57 km) |
| Zachary to Orland Park (Illinois) | 778.05 mi (1,252.15 km) |
| Zachary to Orlando (Florida) | 609.29 mi (980.56 km) |
| Zachary to Ormond Beach (Florida) | 609.32 mi (980.60 km) |
| Zachary to Oro Valley (Arizona) | 1,171.31 mi (1,885.04 km) |
| Zachary to Oroville (California) | 1,813.64 mi (2,918.77 km) |
| Zachary to Oshkosh (Wisconsin) | 933.84 mi (1,502.86 km) |
