| Cities | Distance |
|---|---|
| Heerlen to Opwijk | 78.60 mi (126.50 km) |
| Heerlen to Ostend | 135.14 mi (217.49 km) |
| Heerlen to Oud-Heverlee | 57.53 mi (92.58 km) |
| Heerlen to Oud-Turnhout | 52.72 mi (84.84 km) |
| Heerlen to Oudenaarde | 103.95 mi (167.29 km) |
| Heerlen to Oudenburg | 131.26 mi (211.25 km) |
| Heerlen to Oupeye | 19.16 mi (30.83 km) |
| Heerlen to Overijse | 63.65 mi (102.43 km) |
| Heerlen to Overpelt | 33.71 mi (54.25 km) |
| Heerlen to Paal | 36.88 mi (59.35 km) |
| Heerlen to Peer | 28.77 mi (46.29 km) |
| Heerlen to Pepinster | 23.06 mi (37.11 km) |
| Heerlen to Peruwelz | 108.04 mi (173.87 km) |
| Heerlen to Perwez | 54.12 mi (87.09 km) |
| Heerlen to Philippeville | 78.67 mi (126.61 km) |