641 Area Code — Mason City, IA
Area code 641 serves Mason City and 3 other cities in Iowa. Local time follows America/Chicago. It has no overlay codes.
- State
- Iowa
- Primary city
- Mason City
- Timezone
- America/Chicago
- In service since
- 2000
- Type
- Geographic
- Overlay codes
- None
Cities Served by 641
The 641 area code covers 4 cities and communities in Iowa.
- Mason City
- Ottumwa
- Fort Dodge
- Marshalltown
About Area Code 641
Area code 641 is a North American Numbering Plan (NANP) area code that has been in service since 2000. It is administered by NANPA on behalf of the FCC and serves the Iowa region anchored on Mason City.
641 is currently a single-coverage geographic area code with no overlays. This means a 7-digit number in this area code is unique within its rate centers, though best-practice is always to dial the full 10-digit number when contacting a 641 line.
Mobile numbers in 641 are portable: a person who moved away from Mason City may still carry a 641 mobile number on their device. If you receive an unexpected call from a 641 number, run it through the reverse lookup tool above for the most accurate, free identification.
If you live or do business in Iowa, you may also interact with neighbouring or overlay codes. See the related codes section below to explore the rest of Iowa.
Other Iowa Area Codes
Continue exploring the Iowa numbering plan.
641 Area Code FAQ
Where is area code 641?
Area code 641 is located in Iowa, primarily serving Mason City and surrounding cities including Ottumwa, Fort Dodge, Marshalltown. The region operates on CT (America/Chicago) time.
What state is 641 area code?
641 is a Iowa area code. It was put into service in 2000 and has no overlay codes — it covers its geographic area exclusively.
Is 641 a scam area code?
641 is a legitimate North American area code allocated by NANPA to Iowa. Like any geographic area code, scammers sometimes spoof 641 numbers — judge each call by content (urgent demands, unfamiliar transfers) rather than the area code alone. Run the specific number through our reverse lookup if you're unsure.
What time zone does 641 use?
Area code 641 operates on CT (America/Chicago). Numbers in this area code follow standard Iowa time-zone rules including any daylight-saving transitions for that region.
Can I look up a specific 641 phone number?
Yes. Use the reverse lookup widget above to enter a full 641 number. NumLocation returns the line type (mobile, landline, VoIP), carrier, rate-center city, and any public listings tied to the number — free.