Area Code 970 — Fort Collins, Colorado

NANP area code

970

UTC−7, UTC−6 during daylight saving

State
Colorado
Primary city
Fort Collins
Time zone
Mountain
In service
1995
Overlay
748

The code reaches 199 communities and 32 counties across Colorado.

Was this call legitimate?

The area code itself carries no risk signal. 970 is assigned to Fort Collins, Colorado, 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 970 territory is a plausible-looking origin for a forged 970 number, which is why one can be made to look like a neighbour to so many people. The same applies to its overlay code 748, 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

Mountain · UTC−7, UTC−6 during daylight saving

Reasonable callback window

8:00 AM – 9:00 PM

local time in Mountain

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

970 does not have its territory to itself. 748 covers the same ground, serving Fort Collins and the rest of the 970 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 970, ranked by how many ZIP codes each holds.
CityZIP codesCounty
Fort Collins9Larimer County
Grand Junction7Mesa County
Greeley6Weld County
Durango3La Plata County
Loveland3Larimer County
Montrose3Montrose County
Steamboat Springs3Routt County
Aspen2Pitkin County
Craig2Moffat County
Crested Butte2Gunnison County
Dinosaur2Moffat County
Estes Park2Larimer County
Glenwood Springs2Garfield County
Gunnison2Gunnison County
Pagosa Springs2Archuleta County
Silverthorne2Summit County
Vail2Eagle County
Windsor2Weld County
Akron1Washington County
Almont1Gunnison County

179 further communities not listed. All Colorado area codes →

Each point is a community served by 970, 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 970. 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 970

We do not publish the NXX prefixes inside 970. 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

970 has served this territory since 1995. It eventually ran short of exchanges to hand out, and rather than split the region and make half its residents change their number, the regulator laid 748 over the same ground in 2025. New lines here are issued from the newer code, which is why a neighbour’s number may not start with 970.