| San Mateo to Ukiah (California) | 120.42 mi (193.80 km) |
| San Mateo to Union (Missouri) | 1,698.19 mi (2,732.97 km) |
| San Mateo to Union City (California) | 16.48 mi (26.52 km) |
| San Mateo to Union City (Georgia) | 2,124.70 mi (3,419.38 km) |
| San Mateo to Union City (New Jersey) | 2,563.42 mi (4,125.42 km) |
| San Mateo to Union City (Tennessee) | 1,827.86 mi (2,941.66 km) |
| San Mateo to Union Hill-Novelty Hill (Washington) | 699.83 mi (1,126.26 km) |
| San Mateo to Union Park (Florida) | 2,437.74 mi (3,923.16 km) |
| San Mateo to Uniondale (New York) | 2,586.56 mi (4,162.66 km) |
| San Mateo to Universal City (Texas) | 1,483.31 mi (2,387.16 km) |
| San Mateo to University (Florida) | 2,386.99 mi (3,841.50 km) |
| San Mateo to University City (Missouri) | 1,731.51 mi (2,786.60 km) |
| San Mateo to University Heights (Ohio) | 2,170.01 mi (3,492.29 km) |
| San Mateo to University of California-Santa Barbara (California) | 256.54 mi (412.86 km) |
| San Mateo to University Park (Texas) | 1,472.00 mi (2,368.95 km) |
