Area Code 641 — Cedar Falls, Iowa

NANP area code

641

UTC−6, UTC−5 during daylight saving

State
Iowa
Primary city
Cedar Falls
Time zone
Central
In service
2000

The code reaches 263 communities and 43 counties across Iowa.

Was this call legitimate?

The area code itself carries no risk signal. 641 is assigned to Cedar Falls, Iowa, so a call from it is consistent with a real caller in that area — but the digits alone prove nothing, because they can be forged.

Caller ID is set by whoever places the call, not verified by the network. That is why neighbour spoofing works: an operation anywhere in the world can display a number that matches the area code — and often the first three digits after it — of the person being called, so the call looks local. Every community in the 641 territory is a plausible-looking origin for a forged 641 number, which is why one can be made to look like a neighbour to so many people.

If you did not recognise the call: let it go to voicemail — a legitimate caller with real business will leave one. Do not return the call using the number shown; look the organisation up independently and call the number you found. Never confirm personal details, card numbers, or one-time codes to someone who called you, however plausible the number looked.

Codes.zone publishes no complaint counts, risk scores, or caller identities. We hold no data on individual numbers and will not estimate what we cannot source.

Local time and when to call back

Time there now

Central · UTC−6, UTC−5 during daylight saving

Reasonable callback window

8:00 AM – 9:00 PM

local time in Central

Federal rules bar telemarketing calls to a residence outside 8:00 AM–9:00 PM in the called party's own time zone. It is a sensible bound for a personal callback too — and a caller who rang you well outside it was not observing it.

Overlay codes

641 is the only area code serving its territory — it has no overlay in the current numbering plan for Iowa. Where a region has no overlay, a number's area code still corresponds to a single geographic area.

Cities served

largest 20 by ZIP count
Communities served by area code 641, ranked by how many ZIP codes each holds.
CityZIP codesCounty
Cedar Falls2Black Hawk County
Fairfield2Jefferson County
Mason City2Cerro Gordo County
Melcher Dallas2Marion County
Ackley1Hardin County
Ackworth1Warren County
Adair1Adair County
Afton1Union County
Agency1Wapello County
Albia1Monroe County
Albion1Marshall County
Alden1Hardin County
Alexander1Franklin County
Allerton1Wayne County
Allison1Butler County
Alta Vista1Chickasaw County
Anita1Cass County
Aredale1Butler County
Arispe1Union County
Bagley1Guthrie County

243 further communities not listed. All Iowa area codes →

Each point is a community served by 641, plotted from its record coordinates. The outline is the convex envelope of those points — a footprint, not a boundary.
  • Reference points and footprint
  • Not an official NANPA boundary
  • Not a USPS delivery area

Scope every community matched to 641. Source geoinfo-dataset (full_dataset) ZIP→NPA (2018 snapshot), GeoNames US postal codes (2026-07 postal dump) and Census 2024 county Gazetteer (2024 Gazetteer). Updated . Coordinates are place reference points, not boundaries.

Counties

Prefixes inside 641

We do not publish the NXX prefixes inside 641. The assignment of prefixes to rate centres comes from LERG routing data, which is proprietary, and we will not estimate it from postal data — ZIP codes and telephone prefixes do not map onto each other. Awaiting a clean-rights NPA-NXX source.