| Area Code | 641 |
| State | Iowa |
| Current Time in Area Code 641 | 641> CDT |
| Timezone | Central Daylight Time |
| Regional Market Area | Cedar Rapids-Waterloo-Iowa City and Dubuque Area Des Moines-Ames Area Ottumwa-Kirksville Area Rochester-Mason City-Austin Area |
| Metro Area(s) | Fairfield, IA Marshalltown, IA Mason City, IA Oskaloosa, IA Ottumwa, IA Pella, IA |
| Population (2020) | 467749 |
| Adjacent Area Codes | 319,507,515,563,660,712 |