| Gary to Oak Harbor (Washington) | 1,769.59 mi (2,847.88 km) |
| Gary to Oak Hills (Oregon) | 1,782.93 mi (2,869.35 km) |
| Gary to Oak Lawn (Illinois) | 22.60 mi (36.38 km) |
| Gary to Oak Park (California) | 1,776.93 mi (2,859.70 km) |
| Gary to Oak Park (Illinois) | 30.67 mi (49.37 km) |
| Gary to Oak Park (Michigan) | 222.11 mi (357.44 km) |
| Gary to Oak Ridge (Florida) | 965.81 mi (1,554.32 km) |
| Gary to Oak Ridge (New Jersey) | 667.40 mi (1,074.07 km) |
| Gary to Oak Ridge (Tennessee) | 422.04 mi (679.21 km) |
| Gary to Oakdale (California) | 1,789.56 mi (2,880.02 km) |
| Gary to Oakdale (Minnesota) | 367.12 mi (590.82 km) |
| Gary to Oakland (California) | 1,859.59 mi (2,992.73 km) |
| Gary to Oakland (New Jersey) | 680.65 mi (1,095.40 km) |
| Gary to Oakland Park (Florida) | 1,140.97 mi (1,836.21 km) |
| Gary to Oakleaf Plantation (Florida) | 846.88 mi (1,362.92 km) |
