641 area code
Area code 641 is in Iowa. It covers Marshalltown, Mason City, Ottumwa and 275 other places: 246 ZIP codes in Cerro Gordo, Marshall, Wapello and 38 other counties. Local time there is , Central Time. In service since 2000, with no overlay.
- State
- Iowa
- Time zone
- Central
- Largest city
- Marshalltown
- Overlays
- none
- In service since
- 2000
- Rate centres
- 223
- Prefixes assigned
- 584 (5,840,000 numbers)
Who calls from a 641 number
NANPA records the carrier each block of 641 numbers is assigned to. Of the 4.8 million 641 numbers assigned, 46% are with local phone companies (Windstream and Farmers Tel); 30% with cable, internet-calling, business and other carriers (Onvoy); 24% with mobile carriers (UScellular, T-Mobile and Verizon Wireless).
That is who the numbers were assigned to: people keep their number when they change carrier, so any one number may have moved since.
| Carrier | Kind | Share |
|---|---|---|
| Onvoy | Cable, VoIP, other | 15% |
| Windstream | Landline | 12% |
| UScellular | Mobile | 9% |
| Farmers Tel | Landline | 6% |
| T-Mobile | Mobile | 5% |
| Verizon Wireless | Mobile | 5% |
An area code says where a number was issued, not where the caller is: people keep their numbers when they move, and caller ID can be set to show any number, which the FCC calls spoofing. If a call you did not expect asks for money or personal details, the FCC advises hanging up and calling the company back on a number you look up yourself. Unwanted calls can be reported to the FTC at ReportFraud.ftc.gov.
Places in area code 641
The 212 places with a telephone rate centre of their own using 641, largest first. Each links to its ZIP codes.
Nearby places using 641
These places have no rate centre of their own in NANPA's records; the nearest one uses 641. Near an area-code boundary that can be wrong for part of a town.
- Tama
- Prole
- Lake Panorama
- University Park
- Cedar
- Beacon
- Holiday Lake
- Patterson
- Ionia
- Columbia
- Maharishi Vedic City
- Kirkville
- Mc Intire
- Oakland Acres
- Decatur
- Van Wert
- Lambs Grove
- Bradford
- Harvey
- Woodburn
- Whitten
- Sun Valley Lake
- Chapin
- North Washington
- Beaman
- Keomah Village
- Rock Falls
- Mitchell
- Hamilton
- Cromwell
- St. Anthony
- East Peru
- Selma
- McIntire
- Hansell
- Carpenter
- Leando
- Exline
- Marysville
- Orchard
- Pleasanton
- Numa
- Toeterville
- Hayesville
- Bassett
- Carbon
- Colwell
- Otranto
- Clio
- Rathbun
- Portland
- Ellston
- Owasa
- Duncan
- Le Roy
- Bevington
- Meyer
- Udell
- Roseville
- Ira
ZIP codes in area code 641
246 ZIP codes in 243 towns, by the town each is mailed to, largest first. Each links to its own page.
Where 641 numbers are issued
NANPA's rate centres with the most 641 prefixes (each prefix is 10,000 numbers), under NANPA's own abbreviated names.
| Rate centre | Place | Prefixes |
|---|---|---|
MASON CITY | Mason City | 20 |
NEW HAVEN | New Haven | 17 |
MARSHALLTN | Marshalltown | 16 |
OTTUMWA | Ottumwa | 15 |
NEWHAMPTON | New Hampton | 12 |
OSKALOOSA | Oskaloosa | 12 |
Counties
The counties of its ZIP codes, most residents first, with how many of its ZIP codes each has.
- Cerro Gordo County (10)
- Marshall County (13)
- Wapello County (7)
- Jasper County (10)
- Marion County (10)
- Mahaska County (9)
- Poweshiek County (6)
- Floyd County (7)
- Jefferson County (4)
- Hardin County (7)
- Appanoose County (9)
- Winnebago County (7)
- Union County (6)
- Franklin County (10)
- Tama County (6)
- Chickasaw County (5)
- Hancock County (8)
- Clarke County (4)
- Guthrie County (8)
- Mitchell County (8)
- Davis County (4)
- Lucas County (5)
- Decatur County (7)
- Monroe County (3)
- Worth County (7)
- Warren County (7)
- Keokuk County (8)
- Wayne County (8)
- Madison County (7)
- Adair County (4)
- Ringgold County (7)
- Butler County (3)
- Wright County (2)
- Howard County (2)
- Taylor County (4)
- Adams County (3)
- Grundy County (3)
- Story County (3)
- Van Buren County (3)
- Washington County (1)
- Dallas County (1)
Which code covers where you are now? What area code am I in? answers from your location.
Questions about area code 641
Where is area code 641?
Area code 641 is in Iowa. It covers Marshalltown, Mason City, Ottumwa and 275 other places: 246 ZIP codes in Cerro Gordo, Marshall, Wapello and 38 other counties.
What ZIP codes are in area code 641?
246 ZIP codes, by the town each is mailed to: Marshalltown (50158), Mason City (2, 50401 to 50402), Ottumwa (52501), Newton (50208) and 239 more towns. The full list is on this page.
What time zone is area code 641 in?
Central time.
Is a 641 number a mobile or a landline?
It can be either. 24% of 641 numbers are assigned to mobile carriers and 46% to local phone companies (NANPA, 2026-10-10); the rest are with cable, internet-calling, business and paging carriers. A number keeps its area code when it moves to another carrier.
Does a 641 number mean the caller is in Iowa?
Not necessarily. An area code says where the number was first issued. People keep their numbers when they move or switch carriers, and calling software can show any number, so a 641 call can come from anywhere.
Other area codes in Iowa
All 5 Iowa area codes, by area, with the cities each covers
Source: NANPA NPA database, central office code and thousands-block assignments, 2026-10-10. Places are matched to NANPA's rate centres by name; see sources.
Cite this page
zipcodes.pro. “Area code 641.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/area-code/641
Underlying data is public domain or openly licensed — sources, vintages and licences.