| Bolton Ifran | Western European Time | 00:00 |
| Bolton Idlib | Eastern European Time | -02:00 |
| Bolton Idukki Township | India Standard Time | -04:30 |
| Bolton Idyllwild-Pine Cove | Pacific Time | 08:00 |
| Bolton Ichikawa | Japan Time | -08:00 |
| Bolton Idar | India Standard Time | -04:30 |
| Bolton Idalia | Eastern Australia Time | -09:00 |
| Bolton Illueca | Central European Time | -01:00 |
| Bolton Ilavala Hobli | India Standard Time | -04:30 |
| Bolton Ileret | East Africa Time | -02:00 |
| Bolton Iligan City | Philippine Time | -07:00 |
| Bolton Ilford | United Kingdom Time | 00:00 |
| Bolton Ilfracombe | United Kingdom Time | 00:00 |
| Bolton Ikšķile | Eastern European Time | -02:00 |
| Bolton Humboldt | Central Time | 06:00 |
| Bolton Hunter River | Atlantic Time | 04:00 |
| Bolton Hulshout | Central European Time | -01:00 |
| Bolton Hultsfred | Central European Time | -01:00 |
| Bolton Hulu Langat | Malaysia Time | -07:00 |
| Bolton Huixquilucan de Degollado | Central Time | 06:00 |
| Bolton Hudson | Eastern Time | 05:00 |
| Bolton Hudson Oaks | Central Time | 06:00 |
| Bolton Hubali-Dharwad | India Standard Time | -04:30 |
| Bolton Huez | Central European Time | -01:00 |
| Bolton Hudsonville | Eastern Time | 05:00 |
| Bolton Huehuetoca | Central Time | 06:00 |
| Bolton Hyde Park | Eastern Australia Time | -09:00 |
| Bolton Hyderabad | India Standard Time | -04:30 |
| Bolton Hyderabad | India Standard Time | -04:30 |
| Bolton Hyderabad | India Standard Time | -04:30 |
| Bolton Hyderabad | India Standard Time | -04:30 |
| Bolton Huntingdale | Western Australia Time | -07:00 |
| Bolton Huttons Ambo | United Kingdom Time | 00:00 |
| Bolton Huskisson | Eastern Australia Time | -09:00 |
| Bolton Húsavík | Greenwich Mean Time | 01:00 |
| Bolton Husborne Crawley | United Kingdom Time | 00:00 |
| Bolton Hurstville | Eastern Australia Time | -09:00 |
| Bolton Hurricane | Mountain Time | 07:00 |