| Houston to Portage (Michigan) | 1,016.07 mi (1,635.21 km) |
| Houston to Portage (Wisconsin) | 1,005.28 mi (1,617.84 km) |
| Houston to Portales (New Mexico) | 556.52 mi (895.64 km) |
| Houston to Porterville (California) | 1,434.04 mi (2,307.87 km) |
| Houston to Portland (Maine) | 1,679.00 mi (2,702.08 km) |
| Houston to Portland (Oregon) | 1,831.04 mi (2,946.78 km) |
| Houston to Portland (Tennessee) | 694.99 mi (1,118.47 km) |
| Houston to Portland (Texas) | 175.67 mi (282.71 km) |
| Houston to Portsmouth (New Hampshire) | 1,637.07 mi (2,634.61 km) |
| Houston to Portsmouth (Ohio) | 941.10 mi (1,514.56 km) |
| Houston to Portsmouth (Virginia) | 1,199.56 mi (1,930.50 km) |
| Houston to Post Falls (Idaho) | 1,686.76 mi (2,714.57 km) |
| Houston to Potomac (Maryland) | 1,214.04 mi (1,953.81 km) |
| Houston to Potomac Park (California) | 1,421.89 mi (2,288.31 km) |
| Houston to Pottstown (Pennsylvania) | 1,326.00 mi (2,133.99 km) |
