| Porto Croyde | United Kingdom Time | 00:00 |
| Porto Croydon | Eastern Australia Time | -09:00 |
| Porto Croydon Park | Eastern Australia Time | -09:00 |
| Porto Cuba | Central Time | 06:00 |
| Porto Cuautla | Central Time | 06:00 |
| Porto Cucuron | Central European Time | -01:00 |
| Porto Cuddington | United Kingdom Time | 00:00 |
| Porto Dikson | Krasnoyarsk Time | -06:00 |
| Porto Dillon | Mountain Time | 07:00 |
| Porto Dillingen | Central European Time | -01:00 |
| Porto Differdange | Central European Time | -01:00 |
| Porto Digne | Central European Time | -01:00 |
| Porto Dikili | Turkey Time | -02:00 |
| Porto Crescent Springs | Eastern Time | 05:00 |
| Porto Cremorne | Eastern Australia Time | -09:00 |
| Porto Crestview Hills | Eastern Time | 05:00 |
| Porto Cricket Saint Thomas | United Kingdom Time | 00:00 |
| Porto Crieff | United Kingdom Time | 00:00 |
| Porto Cromwell | Eastern Time | 05:00 |
| Porto Crown Point | Atlantic Time | 05:00 |
| Porto Crows Nest | Eastern Australia Time | -09:00 |
| Porto Crow's Nest | United Kingdom Time | 00:00 |
| Porto Crissier | Central European Time | -01:00 |
| Porto Cross Plains | Central Time | 06:00 |
| Porto Crossville | Central Time | 06:00 |
| Porto Crossways | United Kingdom Time | 00:00 |
| Porto Clarkson | Western Australia Time | -07:00 |
| Porto Clarkston | Eastern Time | 05:00 |
| Porto Claryville | Eastern Time | 05:00 |
| Porto Clarens | Central European Time | -01:00 |
| Porto Claremont | Western Australia Time | -07:00 |
| Porto Clanton | Central Time | 06:00 |
| Porto Clackamas | Pacific Time | 08:00 |
| Porto Fort Stewart | Eastern Time | 05:00 |
| Porto Fort Valley | Eastern Time | 05:00 |
| Porto Fort Washington | Eastern Time | 05:00 |
| Porto Fosdinovo | Central European Time | -01:00 |
| Porto Fortitude Valley | Eastern Australia Time | -09:00 |
| Porto Fortuna | Pacific Time | 08:00 |
| Porto Forte da Casa | Western European Time | 00:00 |
| Porto Forth | Eastern Australia Time | -09:00 |
| Porto Fowey | United Kingdom Time | 00:00 |
| Porto Fostoria | Eastern Time | 05:00 |
| Porto Ellaville | Eastern Time | 05:00 |
| Porto Elkhart Lake | Central Time | 06:00 |
| Porto Elkhorn | Central Time | 06:00 |
| Porto Elkins | Eastern Time | 05:00 |
| Porto Fort Erie | Eastern Time | 05:00 |
| Porto Ellis | Central Time | 06:00 |
| Porto Ellisville | Central Time | 06:00 |