| Walnut Creek to Owosso (Michigan) | 2,004.27 mi (3,225.56 km) |
| Walnut Creek to Oxford (Alabama) | 2,037.11 mi (3,278.41 km) |
| Walnut Creek to Oxford (Mississippi) | 1,821.08 mi (2,930.75 km) |
| Walnut Creek to Oxford (Ohio) | 1,999.60 mi (3,218.04 km) |
| Walnut Creek to Oxnard (California) | 301.73 mi (485.58 km) |
| Walnut Creek to Oxon Hill (Maryland) | 2,417.74 mi (3,890.98 km) |
| Walnut Creek to Ozark (Alabama) | 2,101.44 mi (3,381.94 km) |
| Walnut Creek to Ozark (Missouri) | 1,575.48 mi (2,535.50 km) |
| Walnut Creek to Pace (Florida) | 2,041.21 mi (3,285.01 km) |
| Walnut Creek to Pacific Grove (California) | 88.91 mi (143.09 km) |
| Walnut Creek to Pacifica (California) | 31.27 mi (50.32 km) |
| Walnut Creek to Paducah (Kentucky) | 1,822.00 mi (2,932.23 km) |
| Walnut Creek to Pahrump (Nevada) | 352.69 mi (567.59 km) |
| Walnut Creek to Painesville (Ohio) | 2,160.34 mi (3,476.73 km) |
| Walnut Creek to Palatine (Illinois) | 1,810.33 mi (2,913.45 km) |
