Iowa · Central Time
641 Area Code
Area code 641 is in Iowa, serving north-central and south-central Iowa surrounding the Des Moines area. It is in the Central Time zone.
Last updated October 1, 2026 · Source: NANPA
Where is the 641 area code?
641 is a Iowa area code covering north-central and south-central Iowa surrounding the Des Moines area. In the wider directory it sits in the Midwest region.
Cities in the 641 area code
- Mason City
- Marshalltown
- Ottumwa
- Newton
- Pella
- Oskaloosa
- Clear Lake
- Charles City
- Grinnell
- Fairfield
- Knoxville
- Creston
Counties served by 641
Cerro Gordo County, Marshall County, Wapello County, Jasper County, Marion County, Mahaska County, Floyd County, Poweshiek County, Jefferson County and Union County.
Dialing 641
Mason City, IA is currently served by the single area code 641, with no overlay. Ten-digit dialing (area code + seven-digit number) always works and is increasingly the norm nationwide; some local calls may still connect with seven digits. If a future overlay is added, 10-digit dialing would become mandatory.
From outside the US, dial +1 641 followed by the seven-digit number.
History of the 641 area code
641 went into service on July 9, 2000, created when it was split from 515. It serves Mason City and the surrounding part of Iowa. For how codes are created, split, and overlaid, see how area codes work.
Is 641 a scam or spam risk?
641 is a legitimate geographic area code, not a premium or toll line, so a call from it costs you nothing extra. That said, scammers frequently spoof real local area codes to look familiar on caller ID. A genuine 641 number on your screen is no guarantee the caller is in Mason City, IA or trustworthy. See spam & scam-risk area codes for how spoofing works and how to respond.
Other Iowa area codes
Explore more
See every code in Iowa, compare codes across the Midwest region, or view all Central Time codes. You can also browse the 6XX block or the complete numeric list of US area codes.
New to how this all works? Start with how area codes work, then read up on overlays, 10-digit dialing, and spam & scam-risk codes. To check another number, use the area code lookup tool.
Quick answers
641 area code FAQ
Where is the 641 area code?
The 641 area code is in Iowa, covering north-central and south-central Iowa surrounding the Des Moines area, in the Midwest region.
What cities are in the 641 area code?
Cities in the 641 area code include Mason City, Marshalltown, Ottumwa, Newton, Pella, Oskaloosa, Clear Lake, Charles City, Grinnell and Fairfield.
What time zone is 641 in?
641 is in the Central Time zone.
When did the 641 area code start?
641 went into service on July 9, 2000.
Do I have to dial 10 digits for 641?
Ten-digit dialing always works, and many areas now require it; some local calls in this area may still connect with seven digits.
Is 641 a toll-free or premium code?
No. 641 is a standard geographic area code, so calling it costs the same as any local or long-distance call on your plan. Toll-free calls use 800, 888, 877, 866, 855, 844 or 833.