Area Code 924 — Rochester, Minnesota

NANP area code

924

UTC−6, UTC−5 during daylight saving

State
Minnesota
Primary city
Rochester
Time zone
Central
In service
2024
Overlay
507

The code reaches 246 communities and 32 counties across Minnesota.

Was this call legitimate?

The area code itself carries no risk signal. 924 is assigned to Rochester, 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 924 territory is a plausible-looking origin for a forged 924 number, which is why one can be made to look like a neighbour to so many people. The same applies to its overlay code 507, which serves the same ground.

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 and ten-digit dialling

924 does not have its territory to itself. 507 covers the same ground, serving Rochester and the rest of the 924 territory. An overlay is what a regulator adds when a region runs out of assignable numbers: rather than splitting the area and forcing half the residents to change their number, a second code is laid over the top and new numbers are issued from it.

The practical consequence: two neighbours on the same street can hold numbers in different area codes, so the code tells you nothing about which part of town a caller is in — and local calls must be dialled as all ten digits, because seven is no longer unambiguous.

Cities served

largest 20 by ZIP count
Communities served by area code 924, ranked by how many ZIP codes each holds.
CityZIP codesCounty
Rochester6Olmsted County
Mankato3Blue Earth County
Adams1Mower County
Adrian1Nobles County
Albert Lea1Freeborn County
Alden1Freeborn County
Alpha1Jackson County
Altura1Winona County
Amboy1Blue Earth County
Arco1Lincoln County
Arlington1Sibley County
Austin1Mower County
Avoca1Murray County
Balaton1Lyon County
Beaver Creek1Rock County
Belview1Redwood County
Bigelow1Nobles County
Bingham Lake1Cottonwood County
Blooming Prairie1Steele County
Blue Earth1Faribault County

226 further communities not listed. All Minnesota area codes →

Each point is a community served by 924, 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 924. 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 924

We do not publish the NXX prefixes inside 924. 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.

Why this code exists

924 is the newer code here, added in 2024 over 507 (1954). The older code had run out of exchanges to assign, and an overlay avoids the alternative — splitting the region and forcing half its residents to renumber. New lines have been issued from 924 since.