| Boulder to Yverdon-les-Bains | 5,123.32 mi (8,245.19 km) |
| Boulder to Zofingen | 5,144.38 mi (8,279.08 km) |
| Boulder to Zollikon | 5,163.60 mi (8,310.01 km) |
| Boulder to Zuchwil | 5,135.21 mi (8,264.32 km) |
| Boulder to Zug | 5,169.78 mi (8,319.95 km) |
| Boulder to Zurich | 5,160.80 mi (8,305.51 km) |
| Boulder to Ra's al `Ayn | 6,687.54 mi (10,762.55 km) |
| Boulder to Tall Abyad | 6,669.57 mi (10,733.64 km) |
| Boulder to Acarlar | 6,290.27 mi (10,123.20 km) |
| Boulder to Acigol | 6,441.88 mi (10,367.20 km) |
| Boulder to Acipayam | 6,361.78 mi (10,238.30 km) |
| Boulder to Adakli | 6,549.15 mi (10,539.84 km) |
| Boulder to Adana | 6,556.74 mi (10,552.05 km) |
| Boulder to Adilcevaz | 6,626.99 mi (10,665.12 km) |
| Boulder to Adiyaman | 6,586.97 mi (10,600.70 km) |
