| New Lenox to Olympia Heights (Florida) | 1,174.50 mi (1,890.17 km) |
| New Lenox to Omaha (Nebraska) | 419.19 mi (674.61 km) |
| New Lenox to On Top of the World Designated Place (Florida) | 914.41 mi (1,471.59 km) |
| New Lenox to Onalaska (Wisconsin) | 232.42 mi (374.04 km) |
| New Lenox to Oneida (New York) | 637.70 mi (1,026.28 km) |
| New Lenox to Oneonta (New York) | 665.30 mi (1,070.70 km) |
| New Lenox to Ontario (California) | 1,689.20 mi (2,718.50 km) |
| New Lenox to Ontario (Oregon) | 1,473.77 mi (2,371.80 km) |
| New Lenox to Opa-locka (Florida) | 1,164.88 mi (1,874.70 km) |
| New Lenox to Opelika (Alabama) | 627.76 mi (1,010.28 km) |
| New Lenox to Opelousas (Louisiana) | 792.69 mi (1,275.71 km) |
| New Lenox to Orange (California) | 1,707.55 mi (2,748.03 km) |
| New Lenox to Orange (Texas) | 850.48 mi (1,368.72 km) |
| New Lenox to Orange City (Florida) | 946.38 mi (1,523.05 km) |
| New Lenox to Orangeburg (South Carolina) | 676.50 mi (1,088.72 km) |
