| Ada to Olympia Heights (Florida) | 5,433.35 mi (8,744.14 km) |
| Ada to Omaha (Nebraska) | 5,252.60 mi (8,453.25 km) |
| Ada to On Top of the World Designated Place (Florida) | 5,349.56 mi (8,609.29 km) |
| Ada to Onalaska (Wisconsin) | 4,953.31 mi (7,971.58 km) |
| Ada to Oneida (New York) | 4,422.67 mi (7,117.59 km) |
| Ada to Oneonta (New York) | 4,426.66 mi (7,124.03 km) |
| Ada to Ontario (California) | 6,322.37 mi (10,174.88 km) |
| Ada to Ontario (Oregon) | 5,698.40 mi (9,170.69 km) |
| Ada to Opa-locka (Florida) | 5,421.04 mi (8,724.31 km) |
| Ada to Opelika (Alabama) | 5,299.88 mi (8,529.33 km) |
| Ada to Opelousas (Louisiana) | 5,674.03 mi (9,131.46 km) |
| Ada to Orange (California) | 6,342.53 mi (10,207.32 km) |
| Ada to Orange (Texas) | 5,760.00 mi (9,269.83 km) |
| Ada to Orange City (Florida) | 5,315.80 mi (8,554.96 km) |
| Ada to Orangeburg (South Carolina) | 5,075.64 mi (8,168.46 km) |
