Area Code 641: Mason City, Iowa
641 is a telephone area code serving Iowa, including Mason City, Ottumwa. It is part of the North American Numbering Plan and is dialed with the country code +1.
Numbers beginning with 641 are located in Iowa, United States (NANP region: Central). The code covers Mason City, Ottumwa.
How to Dial Area Code 641
| Calling from | What to dial |
|---|---|
| Anywhere in the US or Canada | 1 641 XXX-XXXX (10-digit dialing: 641 + 7-digit number) |
| Local call inside the same area code | 7-digit number in most areas; 10 digits where an overlay code is active |
| From the UK or Europe | 00 1 641 XXX XXXX |
| From Australia | 0011 1 641 XXX XXXX |
| From a mobile phone anywhere | +1 641 XXX XXXX |
Whatever country you are calling from, the + symbol replaces the exit code. Save the contact as +1 641 XXXXXXX and it will dial correctly from any phone in the world.
Time Zone for Area Code 641
Calls to a 641 number ring in the America/Chicago time zone, standard offset UTC-06:00. Daylight saving time applies here, so the offset moves forward one hour from March to November.
Cities and Communities Served by 641
The following places fall inside the 641 calling area:
Other Area Codes in Iowa
These codes also serve Iowa. Area codes are assigned by the North American Numbering Plan Administration (NANPA).
| Area Code | Cities / Coverage |
|---|---|
| 319 | Cedar Rapids, Iowa City |
| 515 | Des Moines |
| 563 | Davenport, Dubuque |
| 712 | Sioux City, Council Bluffs |
See all 5 area codes in Iowa →
Frequently Asked Questions
Where is area code 641?
Area code 641 is in Iowa, United States. It covers Mason City, Ottumwa.
What time zone is area code 641 in?
Area code 641 rings in the America/Chicago time zone (UTC-06:00 standard).
Do I need to dial 1 before area code 641?
Yes, for a long-distance call inside the US and Canada you dial 1 first, then 641, then the seven-digit number. The 1 is the North American long-distance trunk prefix — it is not the country code. From outside North America you dial your exit code then 1 then 641.
Is area code 641 toll-free?
No. 641 is a standard geographic area code, so normal long-distance rates apply unless your plan includes them. Toll-free NANP codes are 800, 833, 844, 855, 866, 877 and 888.