| Southborough to Pottsville (Pennsylvania) | 3,576.32 mi (5,755.54 km) |
| Southborough to Poughkeepsie (New York) | 3,439.54 mi (5,535.40 km) |
| Southborough to Poulsbo (Washington) | 4,814.00 mi (7,747.39 km) |
| Southborough to Poway (California) | 5,490.17 mi (8,835.57 km) |
| Southborough to Powder Springs (Georgia) | 4,236.93 mi (6,818.68 km) |
| Southborough to Powell (Ohio) | 3,875.22 mi (6,236.57 km) |
| Southborough to Powell (Tennessee) | 4,106.02 mi (6,608.00 km) |
| Southborough to Prairie Ridge (Washington) | 4,835.02 mi (7,781.21 km) |
| Southborough to Prairie Village (Kansas) | 4,377.71 mi (7,045.24 km) |
| Southborough to Prairieville (Louisiana) | 4,668.42 mi (7,513.10 km) |
| Southborough to Prattville (Alabama) | 4,378.15 mi (7,045.95 km) |
| Southborough to Preakness (New Jersey) | 3,484.17 mi (5,607.23 km) |
| Southborough to Prescott (Arizona) | 5,247.64 mi (8,445.27 km) |
| Southborough to Prescott Valley (Arizona) | 5,242.55 mi (8,437.06 km) |
| Southborough to Prichard (Alabama) | 4,530.33 mi (7,290.85 km) |
