| City | Dialing Code | Area Code |
| Hilo | +1 808 | 808 |
| Honolulu | +1 808 | 808 |
| Kailua | +1 808 | 808 |
| Kihei | +1 808 | 808 |
| Mountain View | +1 650 | 650 |
| Pearl City | +1 808 | 808 |
| Volcano | +1 209 | 209 |
| Wahiawa | +1 808 | 808 |
| Wailuku | +1 808 | 808 |
| Waimea | +1 808 | 808 |
| City | Dialing Code | Area Code |
| Hilo | +1 808 | 808 |
| Honolulu | +1 808 | 808 |
| Kailua | +1 808 | 808 |
| Kihei | +1 808 | 808 |
| Mountain View | +1 650 | 650 |
| Pearl City | +1 808 | 808 |
| Volcano | +1 209 | 209 |
| Wahiawa | +1 808 | 808 |
| Wailuku | +1 808 | 808 |
| Waimea | +1 808 | 808 |