| Napa to Oakley (California) | 39.07 mi (62.88 km) |
| Napa to Oakton (Virginia) | 2,405.25 mi (3,870.88 km) |
| Napa to Oakville (Missouri) | 1,723.57 mi (2,773.82 km) |
| Napa to Oatfield (Oregon) | 491.83 mi (791.52 km) |
| Napa to Ocala (Florida) | 2,371.33 mi (3,816.28 km) |
| Napa to Ocean Acres (New Jersey) | 2,548.40 mi (4,101.25 km) |
| Napa to Ocean City (New Jersey) | 2,539.60 mi (4,087.09 km) |
| Napa to Ocean Pines (Maryland) | 2,526.44 mi (4,065.90 km) |
| Napa to Ocean Pointe (Hawaii) | 2,420.74 mi (3,895.80 km) |
| Napa to Ocean Springs (Mississippi) | 1,975.89 mi (3,179.89 km) |
| Napa to Oceanside (California) | 448.39 mi (721.62 km) |
| Napa to Oceanside (New York) | 2,567.54 mi (4,132.05 km) |
| Napa to Ocoee (Florida) | 2,423.24 mi (3,899.83 km) |
| Napa to Oconomowoc (Wisconsin) | 1,789.11 mi (2,879.29 km) |
| Napa to Odenton (Maryland) | 2,434.11 mi (3,917.33 km) |
