Area Code 319 — Cedar Rapids, Iowa

NANP area code

319

UTC−6, UTC−5 during daylight saving

State
Iowa
Primary city
Cedar Rapids
Time zone
Central
In service
1947

The code reaches 182 communities and 25 counties across Iowa.

Was this call legitimate?

The area code itself carries no risk signal. 319 is assigned to Cedar Rapids, 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 319 territory is a plausible-looking origin for a forged 319 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

319 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 319, ranked by how many ZIP codes each holds.
CityZIP codesCounty
Cedar Rapids14Linn County
Iowa City6Johnson County
Waterloo4Black Hawk County
Amana2Iowa County
Cedar Falls2Black Hawk County
Fairfield2Jefferson County
Ainsworth1Washington County
Alburnett1Linn County
Allison1Butler County
Anamosa1Jones County
Aplington1Butler County
Argyle1Lee County
Atkins1Benton County
Aurora1Buchanan County
Austinville1Butler County
Belle Plaine1Benton County
Birmingham1Van Buren County
Blairstown1Benton County
Bonaparte1Van Buren County
Brandon1Buchanan County

162 further communities not listed. All Iowa area codes →

Each point is a community served by 319, 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 319. 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 319

We do not publish the NXX prefixes inside 319. 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.