641 Area Code — Iowa
641 is a North American Numbering Plan area code for Iowa, the United States. It covers about 468,184 people in 244 towns and 247 ZIP codes, including Marshalltown, Ottumwa and Mason City.
| Field | Value |
|---|---|
| Area code | 641 |
| Country | United States (+1) |
| State / province | Iowa |
| Type | Standalone (no other NANP code covers the same towns) |
| Time zone | Central |
| Population covered | 468,184 |
| Towns covered | 244 |
| ZIP codes | 247 |
| Approx. centre | 41.816, -93.217 |
Where area code 641 is used
Area code 641 is assigned to Iowa, the United States, inside the North American Numbering Plan. Numbers in the code are written (641) NXX-XXXX at home and +1 641 NXX-XXXX when dialled from outside Canada and the United States. Since the NANP moved to 10-digit dialling you must always include the area code, even for a local call.
Towns and cities in area code 641
The 244 towns below are the largest in the 641 footprint, ranked by population. Every one of them links to its own page with the full list of area codes and ZIP codes for that town.
| Town | County | Population | ZIP codes |
|---|---|---|---|
| Marshalltown | Marshall County | 31,396 | 1 |
| Ottumwa | Wapello County | 30,371 | 1 |
| Mason City | Cerro Gordo County | 28,703 | 2 |
| Newton | Jasper County | 20,595 | 1 |
| Oskaloosa | Mahaska County | 14,585 | 1 |
| Pella | Marion County | 14,416 | 1 |
| Fairfield | Jefferson County | 12,133 | 2 |
| Grinnell | Poweshiek County | 11,862 | 1 |
| Knoxville | Marion County | 11,117 | 1 |
| Charles City | Floyd County | 9,358 | 1 |
| Clear Lake | Cerro Gordo County | 9,071 | 1 |
| Creston | Union County | 9,034 | 1 |
Counties covered
| County | ZIP codes |
|---|---|
| Marshall County | 13 |
| Jasper County | 10 |
| Franklin County | 10 |
| Marion County | 10 |
| Cerro Gordo County | 10 |
| Mahaska County | 9 |
| Keokuk County | 9 |
| Appanoose County | 9 |
| Guthrie County | 8 |
| Wayne County | 8 |
| Hancock County | 8 |
| Mitchell County | 8 |
Nearby area codes
How to dial area code 641
- Within North America: 641 + 7-digit number (641-NXX-XXXX). The leading 1 is optional on a mobile phone and required on most landlines for long-distance.
- From abroad: your country's international prefix, then 1, then 641, then the 7-digit number — for example 00 1 641 NXX-XXXX from most of Europe.
Frequently asked questions
What area code is 641?
641 is a North American Numbering Plan area code assigned to Iowa, the United States. It covers about 468,184 people in 244 towns.
Is 641 a US or Canadian area code?
641 is a United States area code. Canada and the United States share the +1 country code, so both are part of the same numbering plan.
What time zone is area code 641 in?
Area code 641 is in the Central time zone.
Do I have to dial 10 digits?
Yes. Every NANP call now requires the area code plus the seven-digit number, even for a local call.