| South San Francisco to Ukiah (California) | 111.67 mi (179.71 km) |
| South San Francisco to Union (Missouri) | 1,702.53 mi (2,739.95 km) |
| South San Francisco to Union City (California) | 22.25 mi (35.80 km) |
| South San Francisco to Union City (Georgia) | 2,130.07 mi (3,428.01 km) |
| South San Francisco to Union City (New Jersey) | 2,566.49 mi (4,130.37 km) |
| South San Francisco to Union City (Tennessee) | 1,832.75 mi (2,949.52 km) |
| South San Francisco to Union Hill-Novelty Hill (Washington) | 692.94 mi (1,115.18 km) |
| South San Francisco to Union Park (Florida) | 2,443.92 mi (3,933.11 km) |
| South San Francisco to Uniondale (New York) | 2,589.62 mi (4,167.60 km) |
| South San Francisco to Universal City (Texas) | 1,490.80 mi (2,399.21 km) |
| South San Francisco to University (Florida) | 2,393.36 mi (3,851.74 km) |
| South San Francisco to University City (Missouri) | 1,735.75 mi (2,793.43 km) |
| South San Francisco to University Heights (Ohio) | 2,173.13 mi (3,497.31 km) |
| South San Francisco to University of California-Santa Barbara (California) | 265.64 mi (427.50 km) |
| South San Francisco to University Park (Texas) | 1,478.49 mi (2,379.40 km) |
