Area codes · +1
Area code 641
Area code 641 is centred on Mason City, Iowa. We hold 3,813 allocated blocks for it across 223 rate centres, split 47% mobile, 40% landline and 13% VoIP.
The towns inside area code 641
Area code 641 is not a city code. It covers 223 separate rate centres — billing areas, each its own local calling zone. The largest of them are named in the table below.
That matters twice over. A call between two 641 numbers is not necessarily a local call, because they can sit in different rate centres. And a code this wide narrows a subscriber to a region rather than a town.
Iowa is split across 5 area codes — 515, 712, 641, 319, 563. By allocated blocks 641 is the third largest of them, holding 20% of the Iowa total.
Where 641 numbers are concentrated
NANPA truncates rate-centre names to ten characters and drops the spaces, which is why Charles Cy and Centervl are shortened. Names are reproduced as recorded rather than expanded — the abbreviation is the key the block data is filed under.
| Rate centre | Blocks | Share of 641 |
|---|---|---|
| Mason City | 153 | 4% |
| Marshalltn | 130 | 3% |
| Newhampton | 125 | 3% |
| Ottumwa | 123 | 3% |
| Charles Cy | 113 | 3% |
| Oskaloosa | 101 | 3% |
| Newton | 88 | 2% |
| Pella | 77 | 2% |
| Iowa Falls | 66 | 2% |
| Fairfield | 64 | 2% |
| Knoxville | 61 | 2% |
| Centervl | 60 | 2% |
| Grinnell | 54 | 1% |
| Osceola | 50 | 1% |
| Creston | 49 | 1% |
| Toledo | 48 | 1% |
| Hampton | 45 | 1% |
| Chariton | 44 | 1% |
| Clear Lake | 44 | 1% |
| Northwood | 43 | 1% |
| Britt | 42 | 1% |
| Osage | 41 | 1% |
| Garner | 38 | 1% |
| Manly | 36 | 1% |
199 further rate centres in 641 hold fewer blocks than these.
Carriers holding the most 641 blocks
Onvoy643 blocks
United States Cellular339 blocks
Windstream Iowa Communications, Inc.250 blocks
Verizon Wireless234 blocks
AT&T Wireless168 blocks
Onvoy Spectrum157 blocks
The largest holder, Onvoy, has 17% of the code.
These are original allocations. A number keeps its digits and its block when its subscriber moves network, so a ported 641 number still reports the carrier it started with. Closing that gap needs a live query against the routing database. How line type is derived.
Check a single 641 number, or run a whole list through the free cleaner — neither uploads anything.
Common questions
Where is area code 641?
Area code 641 is centred on Mason City, Iowa and spans 223 rate centres, so it covers a region rather than a town.
Is a 641 number a mobile or a landline?
It can be either, and the digits do not say which. North American mobile and landline numbers share the same ranges, so the answer comes from the carrier holding the block. In 641 the split runs 47% mobile, 40% landline and 13% VoIP, so mobile is the most likely single answer.
Which carriers hold 641 numbers?
The largest holders are Onvoy, United States Cellular, Windstream Iowa Communications, Inc.. That is the carrier the block was allocated to, which is not necessarily the network a given number sits on today.
How many 641 numbers are there?
The code holds 3,813 allocated blocks in our copy of the numbering plan. A block is 1,000 or 10,000 consecutive numbers depending on how deeply it has been pooled, so 641 covers on the order of 3,813,000 possible numbers — most of which have never been issued to anyone.