Newcastle City Area Code List
| Area Codes | Country | State | City | Time Zone | Operating |
|---|---|---|---|---|---|
| 289 | Canada | Ontario | Newcastle | Eastern | Details |
| 307 | US | Wyoming - WY | Newcastle | Mountain | Details |
| 402 | US | Nebraska - NE | Newcastle | Central | Details |
| 405 | US | Oklahoma - OK | Newcastle | Central | Details |
| 916 | US | California - CA | Newcastle | Pacific | Details |
| 940 | US | Texas - TX | Newcastle | Central | Details |