| Houston to Cassina de' Pecchi | 5,423.16 mi (8,727.73 km) |
| Houston to Cassino | 5,761.47 mi (9,272.20 km) |
| Houston to Castagneto Carducci | 5,560.24 mi (8,948.35 km) |
| Houston to Castano Primo | 5,397.05 mi (8,685.72 km) |
| Houston to Castel Bolognese | 5,568.04 mi (8,960.90 km) |
| Houston to Castel Gandolfo | 5,701.36 mi (9,175.46 km) |
| Houston to Castel Goffredo | 5,476.90 mi (8,814.22 km) |
| Houston to Castel Maggiore | 5,540.73 mi (8,916.94 km) |
| Houston to Castel Mella | 5,456.16 mi (8,780.84 km) |
| Houston to Castel San Giorgio | 5,826.74 mi (9,377.24 km) |
| Houston to Castel San Giovanni | 5,442.60 mi (8,759.02 km) |
| Houston to Castel San Pietro Terme | 5,555.92 mi (8,941.40 km) |
| Houston to Castel Volturno | 5,782.64 mi (9,306.26 km) |
| Houston to Castelbuono | 5,913.23 mi (9,516.42 km) |
| Houston to Casteldaccia | 5,883.26 mi (9,468.20 km) |
