Waterloo City Area Code List
| Area Codes | Country | State | City | Time Zone | Operating |
|---|---|---|---|---|---|
| 260 | US | Indiana - IN | Waterloo | Eastern | Details |
| 315 | US | New York - NY | Waterloo | Eastern | Details |
| 319 | US | Iowa - IA | Waterloo | Central | Details |
| 450 | Canada | Quebec | Waterloo | Eastern | Details |
| 579 | Canada | Quebec | Waterloo | Pacific | Details |
| 618 | US | Illinois - IL | Waterloo | Central | Details |
| 740 | US | Ohio - OH | Waterloo | Eastern | Details |
| 864 | US | South Carolina - SC | Waterloo | Eastern | Details |
| 920 | US | Wisconsin - WI | Waterloo | Central | Details |