Waterloo, IA Area Codes
Waterloo is served by area code 319. It is in Iowa, Black Hawk County. About 69,066 people live in its 4 ZIP codes.
| Field | Value |
|---|---|
| Area code(s) | 319 |
| State / province | Iowa |
| County | Black Hawk County |
| Population | 69,066 |
| ZIP codes | 4 |
| Time zone | Central |
| Coordinates | 42.4742, -92.3136 |
What area code is Waterloo in?
| Area code | Main state | Population covered | Overlap |
|---|---|---|---|
| 319 | Iowa | 796,029 | — |
ZIP codes in the code footprint
Nearby towns and their area codes
Cedar Falls 319Waverly 319Marshalltown 641Charles City 641Cedar Rapids 319Marion 319Grinnell 641Anamosa 319
How to dial
Dial 319 + 7 digits for a number in Waterloo, or +1 319 ... from abroad. Ten-digit dialling is required everywhere in the North American Numbering Plan.