Area Code 320 — Willmar, Minnesota

NANP area code

320

UTC−6, UTC−5 during daylight saving

State
Minnesota
Primary city
Willmar
Time zone
Central
In service
1996

The code reaches 171 communities and 30 counties across Minnesota.

Was this call legitimate?

The area code itself carries no risk signal. 320 is assigned to Willmar, Minnesota, 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 320 territory is a plausible-looking origin for a forged 320 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

320 is the only area code serving its territory — it has no overlay in the current numbering plan for Minnesota. 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 320, ranked by how many ZIP codes each holds.
CityZIP codesCounty
Saint Cloud11Stearns County
Howard Lake2Hennepin County
Waite Park2Morrison County
Albany1Stearns County
Alberta1Stevens County
Alexandria1Douglas County
Annandale1Wright County
Appleton1Swift County
Askov1Pine County
Atwater1Kandiyohi County
Avon1Stearns County
Barrett1Grant County
Barry1Big Stone County
Beardsley1Big Stone County
Belgrade1Stearns County
Bellingham1Lac qui Parle County
Benson1Swift County
Bird Island1Renville County
Blomkest1Kandiyohi County
Bock1Mille Lacs County

151 further communities not listed. All Minnesota area codes →

Each point is a community served by 320, 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 320. 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 320

We do not publish the NXX prefixes inside 320. 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.