| Waterloo to Oak Harbor (Washington) | 4,910.98 mi (7,903.46 km) |
| Waterloo to Oak Hills (Oregon) | 5,077.65 mi (8,171.69 km) |
| Waterloo to Oak Lawn (Illinois) | 4,157.34 mi (6,690.60 km) |
| Waterloo to Oak Park (California) | 5,628.40 mi (9,058.03 km) |
| Waterloo to Oak Park (Illinois) | 4,150.55 mi (6,679.67 km) |
| Waterloo to Oak Park (Michigan) | 3,948.82 mi (6,355.01 km) |
| Waterloo to Oak Ridge (Florida) | 4,547.01 mi (7,317.70 km) |
| Waterloo to Oak Ridge (New Jersey) | 3,669.71 mi (5,905.83 km) |
| Waterloo to Oak Ridge (Tennessee) | 4,297.56 mi (6,916.25 km) |
| Waterloo to Oakdale (California) | 5,480.78 mi (8,820.46 km) |
| Waterloo to Oakdale (Minnesota) | 4,191.47 mi (6,745.52 km) |
| Waterloo to Oakland (California) | 5,518.09 mi (8,880.51 km) |
| Waterloo to Oakland (New Jersey) | 3,659.37 mi (5,889.19 km) |
| Waterloo to Oakland Park (Florida) | 4,608.40 mi (7,416.50 km) |
| Waterloo to Oakleaf Plantation (Florida) | 4,480.21 mi (7,210.20 km) |
