| Boulder to Yuncos | 5,018.66 mi (8,076.75 km) |
| Boulder to Zafra | 4,981.20 mi (8,016.46 km) |
| Boulder to Zamora | 4,880.56 mi (7,854.50 km) |
| Boulder to Zaragoza | 5,072.63 mi (8,163.60 km) |
| Boulder to Zarautz | 4,950.98 mi (7,967.84 km) |
| Boulder to Zuera | 5,066.83 mi (8,154.28 km) |
| Boulder to Zumaia | 4,946.82 mi (7,961.14 km) |
| Boulder to Zumarraga | 4,953.59 mi (7,972.04 km) |
| Boulder to Longyearbyen | 3,916.31 mi (6,302.69 km) |
| Boulder to Ahus | 4,924.32 mi (7,924.93 km) |
| Boulder to Akersberga | 4,848.75 mi (7,803.30 km) |
| Boulder to Alingsas | 4,779.83 mi (7,692.40 km) |
| Boulder to Almhult | 4,889.23 mi (7,868.46 km) |
| Boulder to Alta | 4,857.80 mi (7,817.87 km) |
| Boulder to Amal | 4,730.99 mi (7,613.79 km) |
