Caller ID for
Area code 641
Area code 641 Mason City, Iowa
Area code 641 is in Iowa, with numbers assigned in Mason City, New Haven, Marshalltown and 205 more places. It’s 11:10 PM there now.
- State
- Iowa5 area codes in Iowa
- Time zone
- Central11:10 PM there now
- Exchanges
- 584208 places
- Overlay
- NoneThe only code for its area
- No sign-up
- We never contact the number
- Spam risk included
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Where area code 641 is
Numbers in 641 are assigned to 208 places in 41 counties: Cerro Gordo County, Mitchell County, Marshall County, Mahaska County, Wapello County, Marion County, plus 35 more.
No single place dominates: Mason City, the largest, has 3% of the exchanges.
- Mason City20
- New Haven17
- Marshalltown16
- Ottumwa15
- Pella12
- Oskaloosa12
- New Hampton12
- Charles City11
- Newton10
- Fairfield9
- Grinnell9
- Knoxville8
- Little Cedar8
- Iowa Falls8
- Osceola7
- Creston6
- Centerville6
- Clear Lake6
- Chariton5
- Forest City5
- Toledo5
- Lenox5
- Hampton5
- Greenfield4
Phone companies in 641
584 blocks of numbers in 641 are held by 67 phone companies. The most belong to Windstream (123), Verizon Wireless (46) and UScellular (39).
Mostly landline: about 56% of blocks belong to local phone and cable companies, 25% to wireless networks and 19% to other carriers.
A block’s holder is the company it was first assigned to; numbers can move to other carriers since.
History and overlays
641 went into service in 2000, added to the area of 515.
96 new exchanges were assigned since 2021, the latest in June 2026.
Calling 641
It’s 11:10 PM Central time in 641 right now.
From elsewhere in the U.S., dial 1, 641 and the 7-digit number.
Nearby area codes
Iowa has 5 area codes: 319, 515, 563, 641 and 712.
- 515 · Des Moines, IA · about 32 mi
- 319 · Cedar Rapids, IA · about 70 mi
- 563 · Davenport, IA · about 112 mi
- 712 · Sioux City, IA · about 126 mi
- 507 · Rochester, MN · about 146 mi
- 660 · Sedalia, MO · about 178 mi
From the North American Numbering Plan Administrator’s area code and exchange records (10/22/2026) and U.S. Census place and county names. Places and companies are where number blocks were assigned, not where anyone lives or which carrier a number uses today.
Map of the 641 area code
Map of the 641 area code around Mason City, New Haven and Marshalltown, Iowa.
Cities on the map
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Questions about 641
Where is area code 641?
In Iowa, covering Mason City, New Haven and Marshalltown and other places across 41 counties.
What time zone is 641 in?
Central time. It was 11:10 PM there when this page loaded.
Is 641 an overlay?
No. 641 is the only area code for its area right now.
Which phone companies have 641 numbers?
67 companies hold blocks; the most belong to Windstream, Verizon Wireless and UScellular. About 25% of blocks are wireless.
Is 641 running out of numbers?
Not on record. 96 new exchanges have been assigned since 2021.