| San Mateo to Odenton (Maryland) | 2,449.23 mi (3,941.66 km) |
| San Mateo to Odessa (Texas) | 1,196.98 mi (1,926.35 km) |
| San Mateo to Ogden (Utah) | 607.40 mi (977.52 km) |
| San Mateo to Oildale (California) | 233.94 mi (376.49 km) |
| San Mateo to Ojus (Florida) | 2,578.75 mi (4,150.10 km) |
| San Mateo to Okemos (Michigan) | 2,016.16 mi (3,244.70 km) |
| San Mateo to Oklahoma City (Oklahoma) | 1,380.64 mi (2,221.93 km) |
| San Mateo to Okmulgee (Oklahoma) | 1,460.82 mi (2,350.96 km) |
| San Mateo to Olathe (Kansas) | 1,489.58 mi (2,397.25 km) |
| San Mateo to Old Jamestown (Missouri) | 1,732.47 mi (2,788.14 km) |
| San Mateo to Oldsmar (Florida) | 2,374.90 mi (3,822.03 km) |
| San Mateo to Olean (New York) | 2,323.91 mi (3,739.96 km) |
| San Mateo to Olive Branch (Mississippi) | 1,808.65 mi (2,910.74 km) |
| San Mateo to Olivehurst (California) | 113.19 mi (182.17 km) |
| San Mateo to Olney (Maryland) | 2,428.27 mi (3,907.92 km) |
