Area Code | Region | UTC Offset | DST Observed | Description |
|---|
| 211 | -- | | | Local community info / referral services |
| 411 | | | | Reserved for special applications |
| 500 | | | | Personal Communication Service |
| 555 | | | | Reserved for directory assistance applications |
| 600 | | | | Canadian Services |
| 700 | | | | Interexchange Carrier Services |
| 800 | | | | US/Canada toll free (see 888, 877, 866, 855, 844, 833, 822) |
| 811 | | | | Reserved for special applications |
| 822 | | | | US/Canada toll free (proposed, may not be in use yet) |
| 833 | | | | US/Canada toll free (proposed, may not be in use yet) |
| 844 | | | | US/Canada toll free (proposed, may not be in use yet) |
| 855 | | | | US/Canada toll free (proposed, may not be in use yet) |
| 866 | | | | US/Canada toll free |
| 877 | | | | US/Canada toll free |
| 880 | | | | Paid Toll-Free Service |
| 881 | | | | Paid Toll-Free Service |
| 882 | | | | Paid Toll-Free Service |
| 888 | | | | US/Canada toll free |
| 898 | | | | VoIP service |
| 900 | | | | US toll calls -- prices vary with the number called |
| 911 | | | | Emergency |
| 710 | -- | ? | | US Government |
| 311 | -- | -- | | Reserved for special applications |
| 456 | -- | -- | | Inbound International |
| 511 | -- | -- | | Nationwide travel information |
| 611 | -- | -- | | Reserved for special applications |
| 711 | -- | -- | | Telecommunications Relay Services |
| 976 | -- | -- | | Pay services |
| 999 | -- | -- | | Often used by carriers to indicate that the area code information is unavailable for CNID, even though the rest of the number is present |
| 670 | MP | 10 | N | Commonwealth of the Northern Mariana Islands (CNMI, US Commonwealth) |
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