| Silver Spring to Portage (Indiana) | 563.92 mi (907.54 km) |
| Silver Spring to Portage (Michigan) | 500.59 mi (805.62 km) |
| Silver Spring to Portage (Wisconsin) | 717.52 mi (1,154.74 km) |
| Silver Spring to Portales (New Mexico) | 1,492.99 mi (2,402.73 km) |
| Silver Spring to Porterville (California) | 2,290.48 mi (3,686.18 km) |
| Silver Spring to Portland (Maine) | 476.03 mi (766.10 km) |
| Silver Spring to Portland (Oregon) | 2,343.60 mi (3,771.67 km) |
| Silver Spring to Portland (Tennessee) | 544.60 mi (876.46 km) |
| Silver Spring to Portland (Texas) | 1,394.75 mi (2,244.63 km) |
| Silver Spring to Portsmouth (New Hampshire) | 428.99 mi (690.39 km) |
| Silver Spring to Portsmouth (Ohio) | 319.04 mi (513.44 km) |
| Silver Spring to Portsmouth (Virginia) | 153.33 mi (246.76 km) |
| Silver Spring to Post Falls (Idaho) | 2,068.11 mi (3,328.31 km) |
| Silver Spring to Potomac (Maryland) | 9.35 mi (15.05 km) |
| Silver Spring to Potomac Park (California) | 2,302.17 mi (3,704.99 km) |
