| Walnut Creek to Oakleaf Plantation (Florida) | 2,344.31 mi (3,772.80 km) |
| Walnut Creek to Oakley (California) | 19.79 mi (31.86 km) |
| Walnut Creek to Oakton (Virginia) | 2,398.94 mi (3,860.72 km) |
| Walnut Creek to Oakville (Missouri) | 1,714.74 mi (2,759.61 km) |
| Walnut Creek to Oatfield (Oregon) | 519.68 mi (836.35 km) |
| Walnut Creek to Ocala (Florida) | 2,355.75 mi (3,791.21 km) |
| Walnut Creek to Ocean Acres (New Jersey) | 2,543.32 mi (4,093.07 km) |
| Walnut Creek to Ocean City (New Jersey) | 2,534.06 mi (4,078.17 km) |
| Walnut Creek to Ocean Pines (Maryland) | 2,520.04 mi (4,055.62 km) |
| Walnut Creek to Ocean Pointe (Hawaii) | 2,425.68 mi (3,903.75 km) |
| Walnut Creek to Ocean Springs (Mississippi) | 1,959.13 mi (3,152.91 km) |
| Walnut Creek to Oceanside (California) | 418.41 mi (673.37 km) |
| Walnut Creek to Oceanside (New York) | 2,563.31 mi (4,125.25 km) |
| Walnut Creek to Ocoee (Florida) | 2,407.42 mi (3,874.37 km) |
| Walnut Creek to Oconomowoc (Wisconsin) | 1,786.12 mi (2,874.48 km) |
