| Mastic Fosdinovo | Central European Time | -06:00 |
| Mastic Fortitude Valley | Eastern Australia Time | -15:00 |
| Mastic Fortuna | Pacific Time | 03:00 |
| Mastic Forte da Casa | Western European Time | -05:00 |
| Mastic Forth | Eastern Australia Time | -16:00 |
| Mastic Fostoria | Eastern Time | 00:00 |
| Mastic Fowey | United Kingdom Time | -05:00 |
| Mastic Frammersbach | Central European Time | -06:00 |
| Mastic Frampton Cotterell | United Kingdom Time | -05:00 |
| Mastic Frankenberg (Eder) | Central European Time | -06:00 |
| Mastic Frankenburg | Central European Time | -06:00 |
| Mastic Frankenmuth | Eastern Time | 00:00 |
| Mastic Goioerê | Brasilia Time | -02:00 |
| Mastic Goiás | Brasilia Time | -02:00 |
| Mastic Godoy Cruz | Argentina Time | -02:00 |
| Mastic Gogolin | Central European Time | -06:00 |
| Mastic Golling an der Salzach | Central European Time | -06:00 |
| Mastic Golub-Dobrzyń | Central European Time | -06:00 |
| Mastic Goldthwaite | Central Time | 01:00 |
| Mastic Gold Hill | Pacific Time | 03:00 |
| Mastic Goldau | Central European Time | -06:00 |
| Mastic Gojra | Pakistan Time | -10:00 |
| Mastic Gokarna | India Standard Time | -10:30 |
| Mastic Corinth | Central Time | 01:00 |
| Mastic Cordele | Eastern Time | 00:00 |
| Mastic Corella | Central European Time | -06:00 |
| Mastic Corfu | Eastern European Time | -07:00 |
| Mastic Corning | Eastern Time | 00:00 |
| Mastic Cornville | Mountain Time | 02:00 |
| Mastic Corolla | Eastern Time | 00:00 |
| Mastic Cornwall-on-Hudson | Eastern Time | 00:00 |
| Mastic Cornwall | Eastern Time | 00:00 |
| Mastic Coogee | Eastern Australia Time | -16:00 |
| Mastic Cooks Hill | Eastern Australia Time | -16:00 |
| Mastic Coolangatta | Eastern Australia Time | -15:00 |
| Mastic Coolock | Ireland Time | -05:00 |
| Mastic Coolum Beach | Eastern Australia Time | -15:00 |
| Mastic Copacabana | Bolivia Time | -01:00 |
| Mastic Coonoor | India Standard Time | -10:30 |
| Mastic Coopers Plains | Eastern Australia Time | -15:00 |
| Mastic Coopersburg | Eastern Time | 00:00 |
| Mastic Cooperstown | Eastern Time | 00:00 |
| Mastic Cooranbong | Eastern Australia Time | -16:00 |
| Mastic Coorparoo | Eastern Australia Time | -15:00 |
| Mastic Copley | Eastern Time | 00:00 |
| Mastic Coquille | Pacific Time | 03:00 |
| Mastic Coppengrave | Central European Time | -06:00 |
| Mastic Coromandel | New Zealand Time | -18:00 |
| Mastic Devizes | United Kingdom Time | -05:00 |
| Mastic Devrukh | India Standard Time | -10:30 |