Hillsboro City Area Code List
| Area Codes | Country | State | City | Time Zone | Operating |
|---|---|---|---|---|---|
| 217 | US | Illinois - IL | Hillsboro | Central | Details |
| 254 | US | Texas - TX | Hillsboro | Central | Details |
| 304 | US | West Virginia - VA | Hillsboro | Eastern | Details |
| 319 | US | Iowa - IA | Hillsboro | Central | Details |
| 410 | US | Maryland - MD | Hillsboro | Eastern | Details |
| 503 | US | Oregon - OR | Hillsboro | Pacific | Details |
| 575 | US | New Mexico - NM | Hillsboro | Mountain | Details |
| 603 | US | New Hampshire - NH | Hillsboro | Eastern | Details |
| 606 | US | Kentucky - KY | Hillsboro | Eastern / Central | Details |
| 608 | US | Wisconsin - WI | Hillsboro | Central | Details |
| 620 | US | Kansas - KS | Hillsboro | Central / Mountain | Details |
| 636 | US | Missouri - MO | Hillsboro | Central | Details |
| 701 | US | North Dakota - ND | Hillsboro | Central / Mountain | Details |
| 765 | US | Indiana - IN | Hillsboro | Eastern | Details |
| 931 | US | Tennessee - TN | Hillsboro | Eastern / Central | Details |
| 937 | US | Ohio - OH | Hillsboro | Eastern | Details |
| 971 | US | Oregon - OR | Hillsboro | Pacific | Details |