Area code 641: Iowa
Area code 641 is a US state area code for Iowa, on Central Time. It has 584 prefixes in service across 223 rate centers, the largest being Mason City, New Haven and Marshalltown. NANPA lists no overlay code for it. Local calls there take 7 digits.
Local time in area code 641
America/Chicago
Prefixes in service
584 of 792 possible
223 rate centers
Area code 641 facts
| Location | Iowa, United States |
|---|---|
| Time zone | Central Time |
| Overlays | None |
| Split from | 515 |
| In service since | July 9, 2000 |
| Local calls | 7 digits; toll calls 1 + 10 digits |
| Carrier | Not shown. An area code is where a number was issued; numbers port between carriers. Check line type |
Which cities and towns use area code 641?
NANPA records each prefix against a rate center, the local billing area a number belongs to, usually named after its main town. These are the 641 rate centers with the most prefixes in service. 211 smaller ones aren't listed.
| Rate center | Prefixes |
|---|---|
| Mason City | 20 |
| New Haven | 17 |
| Marshalltown | 16 |
| Ottumwa | 15 |
| Pella | 12 |
| Oskaloosa | 12 |
| New Hampton | 12 |
| Charles City | 11 |
| Newton | 10 |
| Fairfield | 9 |
| Grinnell | 9 |
| Knoxville | 8 |
Source: NANPA central office code assignments, file dated 10/17/2026. Each prefix holds up to 10,000 numbers.
How do I dial a 641 number?
NANPA's dialling plan for 641: local calls inside the code take 7 digits, toll calls 1 + 10 digits. From another area code, dial 1 first. From abroad, use +1. The examples use 555-0147, from a range reserved for fictional numbers.
| Local call inside 641 | 555-0147 |
|---|---|
| From another US or Canadian area code | 1-641-555-0147 |
| From outside North America | +1 641 555 0147 |
| E.164, for CRMs and SMS tools | +16415550147 |
When did area code 641 start?
Area code 641 went into service on July 9, 2000, split from 515. It has no overlay, so every number in its area still starts with it.
Tools for 641 numbers
- Area code lookup
Look up any code or a whole list of numbers, or find the codes for a state or city.
- Area code time zone
Local time for a list of numbers, with a callable-now flag.
- NPA-NXX lookup
Rate center and state for one prefix, a level below the area code.
- TCPA calling hours checker
Whether it's inside the federal 8 a.m. to 9 p.m. calling window there now.
Next step
A 641 number tells you where it was issued, not what it is now.
Mobiles, landlines and VoIP lines share area codes, and numbers move between carriers. A live line-type and carrier lookup on every number in your list says which is which, and that decides which calling and texting rules apply. It's in the Email + Phone plan.
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Area code 641 questions
- What state is area code 641?
- Area code 641 is in Iowa, United States. Its largest rate centers by number of prefixes are Mason City, New Haven, Marshalltown, Ottumwa and Pella.
- What time zone is area code 641 in?
- Central Time.
- Does area code 641 have an overlay?
- Not as of NANPA's file dated 10/16/2026. Every number in its area uses 641.
- When did area code 641 start?
- Area code 641 went into service on July 9, 2000, split from 515.
- Is a 641 number a cell phone or a landline?
- The area code can't tell you. In the US and Canada mobiles, landlines and VoIP lines share area codes and prefixes, and numbers move between carriers and line types. Only a live line-type lookup answers it for one number.
- How many phone numbers does area code 641 have?
- 584 of its 792 possible prefixes are in service, and each prefix holds up to 10,000 numbers. That counts prefixes assigned to carriers, not numbers in use.
Other area codes in Iowa
Sources
Location, overlays, in-service date and dialling plan: NANPA NPA database, file dated 10/16/2026. Prefixes and rate centers: NANPA central office code assignments, 10/17/2026. Time zones mapped to the IANA time zone database. By the SimpleVerifier Team; how we build these pages.