| Youngstown Grönland | Central European Time | -05:00 |
| Youngstown Grosse Pointe Park | Eastern Time | 00:00 |
| Youngstown Großpostwitz | Central European Time | -05:00 |
| Youngstown Groß Grönau | Central European Time | -05:00 |
| Youngstown Großerlach | Central European Time | -05:00 |
| Youngstown Drighlington | United Kingdom Time | -04:00 |
| Youngstown Drummoyne | Eastern Australia Time | -15:00 |
| Youngstown Dresher | Eastern Time | 00:00 |
| Youngstown Draycott | United Kingdom Time | -04:00 |
| Youngstown Drayton | United Kingdom Time | -04:00 |
| Youngstown Douglas | Eastern Time | 00:00 |
| Youngstown Doune | United Kingdom Time | -04:00 |
| Youngstown Doveton | Eastern Australia Time | -15:00 |
| Youngstown Dowarabazar | Bangladesh Time | -10:00 |
| Youngstown Dracena | Brasilia Time | -01:00 |
| Youngstown Downingtown | Eastern Time | 00:00 |
| Youngstown Doylestown | Eastern Time | 00:00 |
| Youngstown Dozza | Central European Time | -05:00 |
| Youngstown Dadra | India Standard Time | -09:30 |
| Youngstown Dade City | Eastern Time | 00:00 |
| Youngstown Dabaspete | India Standard Time | -09:30 |
| Youngstown Cyberjaya | Malaysia Time | -12:00 |
| Youngstown Cygnet | Eastern Australia Time | -15:00 |
| Youngstown Cunit | Central European Time | -05:00 |
| Youngstown Cuorgnè | Central European Time | -05:00 |
| Youngstown Curral Velho | Cape Verde Time | -03:00 |
| Youngstown Currans Hill | Eastern Australia Time | -15:00 |
| Youngstown Cullman | Central Time | 01:00 |
| Youngstown Cumberland Park | Central Australia Time | -14:30 |
| Youngstown Cumming | Eastern Time | 00:00 |
| Youngstown Cimadolmo | Central European Time | -05:00 |
| Youngstown Circleville | Eastern Time | 00:00 |
| Youngstown Ciney | Central European Time | -05:00 |
| Youngstown Cifuentes | Central European Time | -05:00 |
| Youngstown Cidade Ocidental | Brasilia Time | -01:00 |
| Youngstown Castellamonte | Central European Time | -05:00 |
| Youngstown Castelnau-de-Montmiral | Central European Time | -05:00 |
| Youngstown Castelsardo | Central European Time | -05:00 |
| Youngstown Choudrant | Central Time | 01:00 |
| Youngstown Chotebor | Central European Time | -05:00 |
| Youngstown Chukai | Malaysia Time | -12:00 |
| Youngstown Christies Beach | Central Australia Time | -14:30 |
| Youngstown Chryston | United Kingdom Time | -04:00 |
| Youngstown Chuo | Japan Time | -13:00 |
| Youngstown Bučovice | Central European Time | -05:00 |
| Youngstown Buckhannon | Eastern Time | 00:00 |
| Youngstown Bryson City | Eastern Time | 00:00 |
| Youngstown Bubendorf | Central European Time | -05:00 |
| Youngstown Buchs | Central European Time | -05:00 |
| Youngstown Buchanan | Eastern Time | 00:00 |